The invention discloses a small joint suture threader which comprises a handle part and an extending part on the front end of the handle part, a clamping part is arranged on the front end of the extending part and used for clamping soft tissue, a suture needle is arranged in the extending part, the suture needle is provided with a suture hooking groove, and a suture pushing mechanism is arranged on the handle part and used for pushing out and pulling back the suture needle, when the suture needle is pushed out, the suture needle penetrates through soft tissue and hooks a suture into the suturehooking groove, and then the suture is hooked back when the suture needle is pulled back. The suture threader of the invention is exquisite and smooth in overall structure, convenient to use and lowin cost, and due to the vertical thin extending structure, the incision is smaller, and suture is easier to operate. During threading, soft tissue is clamped through the clamping part, and then the soft tissue can be punctured and the suture can be hooked back through the push out and pull back of the suture needle, so that clamping of the soft tissue and suture threading can be operated synchronously and conveniently, and is very suitable for surgical threading operation with a very small space, and the surgical threading difficulty is greatly reduced.