Piston test device with cone valve

The invention discloses a piston test device with a cone valve, and relates to the technical field of hydraulic parts, and the piston test device comprises a housing which is internally provided with a cavity for oil feeding and installation; the piston is installed in the shell, the piston comprises a valve hole, and the valve hole is in a through hole shape; the cone valve comprises a valve seat installed in the valve hole and a valve element arranged in the valve seat. The device is simple in structure and convenient to assemble, can simulate the sealing performance of the oil cylinder in different working pressure states, plays a guiding role for a user, enables the user to know the internal leakage critical pressure of the valve element under different working pressures, and can observe the internal leakage critical pressure of the valve element through the observation unthreaded hole in the shell. The internal leakage and the internal leakage amount of a specific valve can be visually seen, meanwhile, t