The invention relates to a plunger valve device specially used for a highly-deviated oil-well pump. A nano ceramic multi-stage spherical sealing plunger valve comprises an upper joint, a plunger piston, a valve body rod mechanism and a valve body rod strengthening sleeve, wherein an upper cover plate is arranged at the front end of the plunger piston; an opening and an overflow hole are formed in the upper cover plate; the valve body rod mechanism is positioned in the plunger piston; the front end of the valve body rod mechanism passes through the opening in the upper cover plate and is connected with the upper joint; the rear end of the valve rod is connected with the valve body rod strengthening sleeve; the valve body rod mechanism comprises a valve body rod and three valve balls which fixedly sleeve the valve body rod at equal spacing; three valve seats are arranged on the inner wall of the plunger piston; the valve seats are in one-to-one correspondence to the valve balls; a sealing spherical surface which is fitted to a corresponding valve ball is arranged on each valve element; and the lower valve ball is connected with the valve body rod straightening sleeve. The plunger valve device solves the problems that when the plunger valve device is transferred to a highly-deviated well section, the plunger piston is stressed to bent and deform and is difficult to move up and down, and the ball valves driven by gravity force are affected by friction force to generate problems such as closed delay, un-tightness and severe leakage in an inclined rail.