Intermediate jacking station mud and sand prevention device

The invention relates to an intermediate jacking station mud and sand prevention device which comprises two intermediate jacking station fixing sealing rings. Four grease oils are formed between the two intermediate jacking station fixing sealing rings and are connected with a grease pump. The four grease oils are distributed along the circumference of an intermediate jacking station. After the intermediate jacking station mud and sand prevention device is adopted, mud can be effectively prevented from entering the intermediate jacking station, the technical problem of friction losses of water stop sealing rubber rings is solved, and using safety of the intermediate jacking station is ensured.