Ring valve type hydraulic feedback oil well pump

The utility model discloses a ring valve type hydraulic feedback oil well pump, mainly solving the problem that a pole pipe is in eccentric wear due to the fact that a pole of the existing oil well pump bends during downward moving. The ring valve type hydraulic feedback oil well pump is characterized in that the lower end of a pump cylinder (1) is connected with a valve body (3), a liquid passage communicated with the pump cylinder (1) is arranged in the valve body (3), and a liquid inlet hole (9) communicated with the liquid passage is formed in the side wall of the lower end of the valve body (3); a traveling valve is connected to the upper end of a plunger (2), the outside diameter of the lower end of the plunger (2) reduces gradually, a liquid via (10) communicated with the plunger (2) is formed in the side wall of the plunger (2), and the plunger (2) is disposed in the pump cylinder (1); the lower end of the plunger (2) is connected with a polish rod (6) through a connecting sleeve (4) and a movable joint (5), the polish rod (6) is arranged in a polish rod cylinder (7) which is disposed in the lower portion of the valve body (3), and the upper end of the polish rod cylinder (7) is connected with a ring valve (8). In application of the ring valve type hydraulic feedback oil well pump, the problem of the eccentric wear of the pole pipe due to the fact that the pole is pressed to bend during downward moving is solved.