Antifouling easy-to-fill grease nipple

The utility model discloses an antifouling easy-to-fill grease nipple, which comprises a reduced cylindrical shell with a straight through hole in the center. One end of the reduced cylindrical shell is a grease filling hole. A hole plugging ball which is controlled by a return spring is arranged in the grease filling hole. The external end surface through hole of the grease filling hole is an internal surface conical guide hole. A movably connected grease cap is arranged on the grease filling hole. When grease is required to be filled into rotating equipment, the grease cap is removed, a grease gun is inserted into the guide hole and is accurately aligned with the grease filling hole, and after the grease is filled, the grease cap is covered and fouling and dirt can be prevented. The antifouling easy-to-fill grease nipple has the advantages of ingenious design, simple structure, good effect and easiness in production.