How To Tie Two Fishing Lines Together? Steps for 3 Easy Knots

Whether you are new to fishing or a seasoned pro, there may come a time in the fishing career that you need to know how to tie two fishing lines together.

From a broken line to joining lines of differing diameters, there are several string knots you can choose from that will allow you to combine two lines together.

One of the strongest options is the surgeon’s knot which is a quick and easy way to join any type of line together. If you want to do a knot that is stronger, the double uni knot is a great alternative that is also ideal for all types of line.

The only downside to the uni is that it is a bit more complex, which in turn makes it more time-consuming. In addition to these all-purpose knots, there are some that have specific uses, such as the Albright knot for fly fishing.

Types of Knots and Their Uses

One of the most common badge that kids earn in the Scouts is the knot tying badge because there are a ton of ways you can tie a single rope, join multiple ropes, and tie fishing lines together. Some of the most popular knots that are used to join two lines together are the blood knot, double uni, the J knot, and the surgeon’s knot. Those are just a few examples of how to tie two fishing lines together. While all knots can be used to join two pieces of the same type of lines together, there are plenty of options for joining differing types together as well.

All-Purpose Knots

Just like not all fishing situations are the same, not all knots can be used in each case. While there are some knots that are designed for specific uses, the uni and the surgeon’s knots are both pretty easy to accomplish and can be used in just about any application.

Surgeon’s Knot

First, we are going to cover the steps for completing the surgeon’s knot to join your lines together. This method can be used for lines that are the same size or different sizes.

  1. The first step is to lay your lines parallel to each other, running in opposite directions. They should overlap each other by about 6 inches or 15 centimeters which will allow them to be looped where they overlap.
  2. Take both lines, holding them at the right-hand side, and create a loop by crossing them over themselves on top. Make sure there is enough line that you’re able to tie a double overhand knot.
  3. Wrap the ends of the line underneath the parallel lines and pull them through the loop, tying a knot. Leave a bit of slack in the loop so you can pass through again.
  4. Cross your ends over and under the 2 lines again, creating a double overhand knot. Add a third pass for added security. This is called the triple surgeon’s knot.
  5. Take both ends and pull tight. Trim the short, loose ends, also known as the tag ends.

Double Uni Knot

If you want to do a knot that is even stronger than the surgeon’s knot, the double uni would be a great choice. This another option if you have two different types of lines that you want to combine.

  1. Just as with the surgeon’s knot, start out by overlapping the two lines by 6 inches, running in opposite directions.
  2. Using just one of the lines, create a loop by circling the line down, then up and over both lines. Bring it down behind the overlapped lines and through the loop, roughly in the center where the overlap.
  3. Next, you’ll wrap the same end around both lines 6 times. Be sure to leave the loop loose enough for the line to pass through it.
  4. Once you finish the 6 passes, you will pull the tag end to pull the knot closed. The line will look like coiled, similar to a spring. This is a single uni knot.
  5. Repeat the process on the other end with the other line. This will give you two knots on the lines with a few inches in between.
  6. Grab your lines and pull so that the knots meet in the middle, giving you the double uni knot.
  7. After you have achieved the double uni, trim the tag ends. Be sure to trim as close to the knots as possible without accidentally clipping the knot itself.

Fly Fishing Knots

Knots that are good for fly fishing can certainly be used in multiple applications if needed but they are ideal for fly fishing because they can easily slide through your reel’s guides in case a fish pulls out your fly line and reaches the backing line.

Albright Knot

  1. Take the end of one of the lines and create a loop. If you are using two different thicknesses, make the loop with the thicker line. If the lines are the same thickness, you can use either line.
  2. Next, slide the non-looped line through the loop, from the bottom.
  3. Pull the line behind both ends of the loop and wrap it around the lines, looping it 10 times.
  4. Slide the end of the line you were wrapping with through the loop.
  5. Pull both ends to tighten completely. Trim the tag ends.


When it comes to learning how to tie two fishing lines together, there are several methods you can use to attach multiple lines. Whether your lines are the same thickness or they are different, It is much easier than you may think to attach them to each other. From all-purpose knots to fly fishing knots, there is a knot for every situation.

If you want to learn how to tie two fishing lines together, follow these simple instructions and you’ll be a pro in no time.