Shield tail sealing grease injection system

The utility model relates to a sealing grease injection system. The sealing grease injection system comprises an air circulation loop (S) and a sealing grease conveying passage (M) connected with the air circulation loop (S) in parallel. The air circulation loop (S) comprises a first pressure adjustment valve (3), a reversing valve (4) and an air cylinder motion loop (S1) with a plurality of air cylinders, wherein the first pressure adjustment valve (3), the reversing valve (4) and the air cylinder motion loop (S1) are sequentially connected with an air inlet. The sealing grease conveying passage (M) comprises a second pressure adjustment valve (14), a pneumatic pump (8) used for discharging sealing grease and a grease compressing disc (5) used for compressing the sealing grease, wherein the second pressure adjustment valve (14), the pneumatic pump (8) and the grease compressing disc (5) are sequentially connected with the air inlet, and the grease compressing disc (5) is connected with a bridge (15) through an air cylinder. According to the sealing grease injection system, as an air cylinder motion loop is adopted in cooperation with the sealing grease conveying passage, the sealing grease is stably injected, and the high stability is achieved.