The invention relates to the technical field of eel bone removal, in particular to an eel bone removal knife. An eel boning knife, comprising: a handle and two blades that are symmetrical about the central axis where the handle is located, the handle is connected to the blades through a distance adjustment device, and the distance adjustment device includes: a support seat, the support seat It includes: an outer frame and an inner frame, the outer frame and the inner frame are connected through a rack, a screw, one end of the screw is fixedly connected with the knife handle, and the other end passes through the support seat and is rotatably connected with it, two slides The sliders are distributed symmetrically along the straight line where the screw is located. The sliders are slidably connected to the support base. The distance between the two sliders along the direction of screw extension decreases. The blade is sandwiched between the slider and the support seat. between supports. The invention provides an eel deboning knife, which solves the problem that eels of different body sizes cannot be adjusted for deboning, and improves the work efficiency of eel deboning.