The original controlling system for hydraulic pressure detection of the vehicle gas cylinder is deficient in safety protection measures for detection equipment and operator.A multiple protection controller was introduced, which could adapt to a variety of types and sizes of the external power supply.The original controlling system could only work under the circumstance satisfying the detecting condition, and the detection device and controller being in good working order.It can realize multiple security protection function and display realtime detection process data and fault information, and also facilitate rapid diagnosis and troubleshooting for the maintainer.It is of simple operation, convenient use and maintenance.