The invention relates to a hydraulic loading-limit mechanical variable speed winch, and belongs to the field of hoisting equipment. The hydraulic loading-limit mechanical variable speed winch comprises a hydraulic control system, a quick-connecting high pressure oil pipe and a drawing head device. The drawing head device and the hydraulic control system are connected through the quick-connecting high pressure oil pipe. The drawing head device comprises a base, a steel wire rope guide device, a winching cylinder support frame, a hydraulic motor, a motor protecting frame, a variable speed transfer case, a winching cylinder, a locking device, a speed reducing mechanism and a gear change hand lever. The steel wire rope guide device is installed on the base. The hydraulic motor is fixed to the variable speed transfer case. The motor protecting frame is arranged outside the hydraulic motor. The variable speed transfer case is fixed to the base and connected with the speed reducing mechanism, and the gear change hand lever is arranged on the variable speed transfer case. The speed reducing mechanism is installed inside the winching cylinder, and the cantilever end of the winching cylinder is supported by the winching cylinder support frame. The winching cylinder support frame is locked through the locking device and fixed to the base. The hydraulic loading-limit mechanical variable speed winch is reasonable in structure, convenient to operate, low in cost, safe and reliable.