The invention relates to a bolt combiner using a kerf nut, which belongs to the technical field of mechanical connecting pieces. The bolt combiner comprises a bolt and a nut, wherein the bolt comprises a bolt head, a bolt cylindrical part and a threaded part; the threaded part consists of an incomplete threaded part, a thread tooth removing part and a complete threaded part; and the middle-upper parts of two sides of the nut are provided with an annular kerf of which the cross section is triangular or trapezoidal respectively. When the kerfs on two sides of the nut are compacted, the screw pitch of two sides of the nut is shortened and the threaded combination with the bolt is more tight, thus the bolt combiner can effectively prevent looseness and improves the fatigue strength; besides, the bolt combiner has low cost and can be produced in batches.