SFD-9 type high voltage circuit breaker simulation device is mainly used for the whole group test of relay protection device and in the backup power self-throwing device test and other projects to replace the real high voltage circuit breaker. This simulation device uses a single chip microcomputer as the control core to realize the simulation of high voltage circuit breaker jump, closing time setting, input signal logic control and other functions, so as to simulate the jump, closing action of high voltage circuit breaker, and provide a set of completely isolated DC voltage output. The device is simple and reliable to operate.