The geological conditions of coal mining are relatively complicated in China, with relatively high roof hazards. In order to ensure the reliability of the roof support hydraulic support, a set of hydraulic support pressure monitoring system was designed, and the system scheme, function, software and hardware were analyzed and discussed. Practice has shown that the system adopted ARM processor and was designed with wireless communication technology to solve the problem of narrow underground space and inconvenient line laying. The data transmission was accurate, which provided important data support for mines to prevent underground roof accidents.