The invention relates to a simulated experimental device for opening/closing of a high-voltage breaker. The simulated experimental device comprises a driver, a tooth bar, a slide block, a slide rail,a moving arc contact and an arc generator, the tooth bar is arranged on the slide block, the slide block is arranged on the slide rail in a sliding manner, a gear is arranged in the output end of thedriver, and engaged with the tooth bar, one end of the moving arc contact is connected with the tooth bar, and the other end of the moving arc contact is arranged in the arch generator. According to the simulated experimental device for opening/closing of the high-voltage breaker, transmission is realized via the gear and tooth bar, it is ensured that moving and static arc contacts are joint accurately in the opening/closing process of the breaker, the motor speed can be controlled accurately by changing parameters of a controller, experimental loops are established in the lab condition, opening/closing at different speeds is simulated, and the opening/closing process at different speeds is monitored online.