The utility model discloses a hydraulic motor rotary wheel set disassembling and assembling machine, and relates to the filed of mines, in particular to the hydraulic motor rotary wheel set disassembling and assembling machine used for disassembling and assembling of wheel sets of various mine cars. The hydraulic motor rotary wheel set disassembling and assembling machine comprises a work bench and a hoisting system, the hoisting system is connected with the work bench, the work bench is further provided with a guide trolley moving transversely, the upper side of one end of the work bench is connected with a horizontal oil cylinder, a piston rod of the oil cylinder is connected with a fixing rack, a pair of iron clamps are hinged to the fixing rack, the other end of the work bench is vertically provided with a connection plate, the connection plate and the work bench are fixedly connected and located on the same plane, a hydraulic motor is arranged with the upper portion of the connection plate, and an output shaft of the hydraulic motor is longitudinally arranged and is connected with an inner socket wrench. When the output shaft of the hydraulic motor rotates anticlockwise, locking nuts are loosened, and when the output shaft of the hydraulic motor rotates clockwise, the locking nuts are fastened so that work efficiency can be greatly improved, and labor and expenses can be greatly saved.