The utility model provides a device for detecting deformation of a shell in the vacuumizing process of GIS equipment. The device comprises a detection plate, a correlation type infrared sensor, a microprocessor and an audible and visual alarm, wherein the detection plate is vertically arranged on the side face of a shell of the GIS equipment, the transmitting end and the receiving end of the opposite-type infrared sensor are correspondingly arranged at the two ends of the shell of the GIS equipment, and the height of the detection plate is larger than that of the opposite-type infrared sensor;the correlation type infrared sensor is electrically connected with the microprocessor through the sensor control circuit, and the audible and visual alarm is electrically connected with the microprocessor through the audible and visual alarm circuit. According to the utility model, whether the housing of the GIS equipment deforms or not can be monitored in real time in the vacuumizing operationprocess of the GIS equipment; and if the shell of the GIS equipment deforms, a sound-light alarm can be given out to remind a worker to handle in time, so that the potential safety hazard of vacuumizing operation of the GIS equipment is effectively avoided, meanwhile, manpower and material resources are saved, and the working efficiency is greatly improved.