A cementing device salvage device is composed of a lifting short section, an inner tube body, an upper tube body, a steel ball, a movable ring, a movable pin, a lower tube body, a conical body, a spring, a sliding sleeve, screws, a push rod, a slip and a guiding tapered mill which are arranged from top to bottom. The lifting short section is in threaded connection with the inner tube body, and thelower end of the lifting short section is provided with a U-shaped clamping groove which is clamped into a T-shaped clamping groove of the upper tube body in a matched mode. The upper tube body is inthreaded connection with the lower tube body, and a bearing set is pressed into the threaded connecting position. The movable pin in the bearing seat moves in a long-short groove in the outer side ofthe inner tube body, thus the conical body is in threaded connection with the inner tube body. The spring, the sliding sleeve, the push rod and the slip are arranged on the outer side of the conicalbody from top to bottom, the push rod is connected with the sliding sleeve and the slip through the screws, and the guiding tapered mill is in threaded connection with the lower tube body. After cementing well completion, all assemblies in an inner cavity can be subjected to salvage to get out from a wellhead by using the cementing device salvage device, the well building period is shortened, thewell cementing quality is improved, and the situation that subsequent tool lowering for measure work is not influenced by the dimension of the drift diameter in a sleeve is guaranteed.