The utility model discloses a high-efficiency lubricating oil slinger for a sliding bearing, which relates to a body (1) of the oil slinger. The inner surface (2) of the body (1) is a curved surface in arc connection, which at least comprises two sections of arcs in connection. The inner ring surface of the body is in contact fit with a lubricating shaft, namely line contact in the prior art is changed into surface contact, the inner ring surface is the curved surface, and the contact area is enlarged, so that the inner ring surface is full in oil discharge; meanwhile, an enough friction force is generated to drive the oil slinger to make micro vibration on the shaft, and thus the oil discharge rate of the whole oil slinger is improved. Blind hole type oil grooves are formed in two sides of the body, so that the oil carrying quantity of the oil slinger increases. The high-efficiency lubricating oil slinger is simple in structure, stable and reliable in operation, easy to detach and mount, large in oil carrying quantity and reliable in lubrication and is particularly suitable for a large sliding bearing lubricating structure of a high-power high-voltage synchronous motor, the lubricating effect is improved, and the service life of the bearing is prolonged.