Locking bone joining screw of variable thread structure

The invention provides a locking bone joining screw of a variable thread structure. The locking bone joining screw comprises a screw cap and a screw rod, wherein the screw rod is provided with variable threads; the variable threads are gradually widened and deepened from the end adjacent to the screw cap to the far end. According to the locking bone joining screw, internal fixation implanting of articular surface fracture can be realized without pressurizing, blood supply is kept, the fixation is firm and I-phase healing is realized.