The three-position three-way water hydraulic reversal valve as directional control element of hydraulic system is formed from two symmetrically-connected inverted mouth cone valves with identical structure, each of them includes valve body with inverted mouth cone valve seat, value core, rubber diaphragm, cylinder piston, cylinder piston guide sleeve, reset spring and end cover. The rubber diaphragm can separate the internal space of the valve body into working cavity and cylinder cavity, the valve body as working cavity is equipped with external-connected working interface, an electromagnetic pilot is mounted on the valve body, and said rubber diaphragm can isolate the working main flow channel from cylinder cavity, so that it can prevent the working component in the cylinder from being corroded and worn.