The utility model provides a disassembling tool which comprises a base, a supporting device and a fixing device, an abutting device is arranged on the base, one end of the abutting device is fixedly connected with the base, and the other end of the abutting device is a free end. The supporting device is arranged between the base and the fixing device and used for supporting the fixing device. Thefixing device is provided with a clamping ring, the clamping ring is located above the abutting device, and at least one of the supporting device and the abutting device can move in a telescopic modein the vertical direction. According to the utility model, the snap ring of the fixing device is clamped at the step or groove on the outer surface of the shaft sleeve; and then at least one of the supporting device and the abutting device stretches out and draws back in the vertical direction, the free end of the abutting device abuts against the end of the pump shaft, abutting force is applied to the end of the pump shaft, and the shaft sleeve is gradually detached from the pump shaft. Due to the fact that the applied abutting force is uniform and stable, the shaft sleeve is not prone to being damaged in the dismounting process, and the dismounting efficiency is effectively improved.