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A piston installation tool, relating to the field of engine technology, is used to install a piston assembly into a cylinder liner. It includes an upper guide sleeve and a lower guide sleeve coaxially disposed below it. The upper guide sleeve has an upper through hole extending through both ends along its axial direction, the upper through hole comprising at least two axially connected guide hole segments, each guide hole segment being tapered. The lower guide sleeve has a lower through hole extending through both ends along its axial direction, the lower through hole being cylindrical, with the lower guide hole segment connected to the lower through hole. An operating window is provided on the upper guide sleeve, communicating with the upper through hole, the lower end of the operating window not exceeding the connection point between the guide hole segment and the lower through hole. This application can reduce tool height and production costs; simultaneously, it can adjust and reset piston rings, preventing piston rings from dislodging from the ring groove and improving yield.