The invention relates to the technical field of high-
voltage switch cabinets, in particular to a high-
voltage switch cabinet fault detection device which comprises a cabinet body, an instrument chamber, a
bus chamber, a cable chamber, a tool chamber and a handcart chamber are sequentially arranged in the cabinet body, and a
microcomputer is mounted on the inner side of the instrument chamber. The instrument chamber, the
bus chamber, the cable chamber and the handcart chamber are communicated with the sealing cylinder, and because each compartment of the existing high-
voltage switch cabinet adopts a sealing design to avoid mutual interference, when a fault occurs in any chamber, an
abnormal discharge phenomenon is caused, composition materials in the cabinet body are decomposed to generate gas, and air pressure fluctuation is caused. And each air
pressure sensor can monitor the air pressure fluctuation of each cavity at one end of the tool chamber through the other end of the communicating
pipe, and the propagation and judgment of the air pressure fluctuation can be free from or less interfered by high-pressure, high-temperature and complex electromagnetic environments in the cabinet body, so that the
advantage of high fault detection reliability is achieved.