The utility model discloses a high -voltage switch speed sensor, including locating the accelerometer on the high -voltage switch mechanical motion position and passing through the host computer thatshielded cable links to each other with this accelerometer, accelerometer includes acceleration sensor and filter circuit, the host computer includes instrument panel, mainboard, preliminary treatmentboard, external control board and channel board, line synchronization AD converter and the memory cell that be equipped with CPU on the mainboard, link to each other with accelerometer, CPU gathers accelerometer's output signal through control of preliminary treatment board and line synchronization AD converter to behind the time signal that synchronous sampling preliminary treatment board obtained, memory cell is used for storing this output signal and time signal. The utility model discloses not needing complicated sensor jig to come the different high -voltage switch of adaptation, greatlyhaving simplified the design of anchor clamps, can install in narrow and small space, on -the -spot installation is simple high -efficient, strong adaptability, and measurement accuracy is high.