Sealing silica gel ring for cup

The utility model discloses a sealing silica gel ring for a cup. The utility model relates to the technical field of cup sealing rings. The device comprises a device main body, friction lines are arranged at the upper end of the device main body, a built-in clamping groove is formed in the outer side of the device main body, an inner ring wall is arranged on the inner side of the device main body,an exhaust hole is formed in the inner side of the device main body, an inner buckle is arranged in the inner ring wall, and an anti-corrosion layer is arranged on the inner side of the device main body. An internal buckle and a built-in clamping groove are arranged on the device main body; the cup cover is buckled by the device main body through the internal buckle and the built-in clamping groove; the device main body cannot be sucked out due to suction force after the cup cover is opened for a long time; the exhaust holes are formed, so that air in the device main body and the cup cover can be exhausted from the e