Oil drainage device

The utility model discloses an oil drainage device which comprises an outer barrel, an inner barrel in the outer barrel and a control ball. The outer barrel is provided with first grooves and second grooves. Outer barrel oil outlet holes are formed in the wall of the outer barrel. Through holes are formed in the wall of the inner barrel. Sealing pieces capable of blocking the outer barrel oil outlet holes are arranged on the outer wall of the inner barrel. The control ball is arranged between the outer barrel and the inner barrel. The distance between the walls of the first grooves and the outer wall of the inner barrel and between the walls of the second grooves and the outer wall of the inner barrel in the radial direction of the outer barrel is smaller than the diameter of the control ball. The control ball can move between the first grooves and the second grooves in a circulating mode, and when the control ball moves from the first grooves to the second grooves, the sealing pieces can be driven to move and open the outer barrel oil outlet holes. When the control ball moves from the second grooves to the first grooves, the sealing pieces are driven to block the outer barrel oil outlet holes. The oil drainage device can be repeatedly used.