UPS external bypass switching device

The invention belongs to the technical field of electrical engineering, and discloses a UPS external bypass switching device. The UPS external bypass switching device comprises a main switching loop and a detection control loop, wherein the main switching loop comprises a city power supply branch and a UPS power supply branch; the detection control loop comprises a city power controllable silicongroup arranged on the city power supply branch and a UPS controllable silicon group arranged on the UPS power supply branch, both the two groups of controllable silicon groups are connected with an optocoupler relay group circuit, the optocoupler relay group circuit comprises a rectification circuit connected with the two groups of controllable silicon groups, a first optocoupler relay and a second optocoupler relay, and the first optocoupler relay and the second optocoupler relay are connected with the rectification circuit. According to the UPS external bypass switching device, the city power controllable silicon gr