The invention discloses a disassembly device for petroleum drilling equipment. The device comprises a pipe shell part, a beating rod and a power part; the pipe shell part comprises a screw cover and apipe body; one end of the pipe body is of a convex structure; the convex structure is provided with a first opening; the screw cover is provided with a second opening; the beating rod is accommodatedin the pipe body, and one end extends out of the pipe body by the first opening and the second opening; the beating rod can move in the axial direction of the pipe body; a limiting ring is arranged in the peripheral direction of the beating rod; the power part comprises a slide block and a piston arranged in the pipe body in sequence in the direction of the beating rod extending out of the pipe body and capable of sliding on the inner wall of the pipe body; the piston is provided with a driving transmission module; and a ventilation hole is formed in the side wall, near the sliding area of the beating rod, of the pipe body. The disassembly device for the petroleum drilling equipment uses mechanical tools for replacing manual operations to finish disassembly of such parts as pins, improvesthe equipment disassembly operation efficiency, and meanwhile, prevents potential safety hazards caused by manual intervention in the operations.