Oil stop cover of locomotive and oil stopping method of oil seal system of traction motor of locomotive

The invention provides an oil stop cover of a locomotive and an oil stopping method of an oil seal system of a traction motor of the locomotive. An oil stop cover main body part adopts an uneven stepped structure, a through hole is formed in the middle of the oil stop cover main body part, a second backflow notch is formed in the edge of the oil stop cover main body part, a primary oil stop ring and a secondary oil stop ring which are fixedly connected with the oil stop cover main body part are arranged in the through hole surrounding direction, and a first backflow notch is formed in the primary oil stop ring; preferably, a backflow guide groove and a groove are also formed in the oil stop cover main body part, and two ends of the backflow guide groove are communicated with the groove and the second backflow notch respectively. The oil stop cover of the locomotive and the oil seal system of the traction motor are assembled for use, lubricating oil (grease) entering space inside the oil stop cover can flow out of the oil stop cover easily via the first backflow notch and the second backflow notch and then flow back to a gearbox, the oil stop performance of the oil seal system of the traction motor is effectively improved, and the hidden danger that a lubricating agent used by a bearing system of the traction motor is polluted by the lubricating oil (grease) in the gearbox is effectively eliminated.