The invention belongs to the technical field of medical instruments, in particular to a multifunctional flap retractor in breast surgery. The device comprises a mounting frame assembly, an adjusting frame assembly, a tractor assembly and an adjusting assembly, the adjusting frame assembly is fixedly mounted at the top of the mounting frame assembly, the retractor assembly is fixedly installed in the middle of the adjusting frame assembly, the retractor assembly comprises a retractor frame, a sliding groove, a sliding block, connecting blocks and second butterfly bolts, the connecting blocks are welded to the tractor frame in the front-back direction, the opposite sides of the two connecting blocks are in threaded connection with the second butterfly bolts; the top of the retractor frame isfixedly provided with the sliding groove, the inner wall of the sliding groove is connected with the sliding block in a sliding mode, and the top of the sliding block is fixedly provided with the adjusting assembly. The flexibility of the retractor is improved, adjustment is convenient, the traction effect is improved, the operation of medical staff is facilitated, and therefore the comprehensiveeffect of shortening the operation time is achieved.