Sleeve monitoring device

The utility model provides a sleeve monitoring device which includes a sleeve (6) and a pressure transmitter (4). The pressure transmitter (4) is sealedly connected with the sleeve (6) via an opening (61) which is arranged in the sleeve (6). The sleeve monitoring device may also include an alarm system (8) which is connected with the pressure transmitter (4). The sleeve monitoring device is simple in structure, convenient to maintain, and high in security, and can monitor the pressure change in the sleeve at any moment, thus being capable of confirming the security condition of the sleeve.