In a modular structure of independent output/input socket for UPS, when UPS needs to be repaired, the bypass switch of the detachable socket is turned on, so that the input power is directly connected with power output sockets through the power input wire. The detachable socket is then removed from the UPS host, and the UPS host is sent to be repaired. Load equipment plugs do not need to be unplugged from the power output jacks one by one, and moved to the power socket on the wall. If there are not enough power sockets on the wall, then additional extension wire sockets having multi-jacks need to be utilized for electrical connection. The action of unplugging and plugging in load plugs into the different power sources can be tedious and even dangerous. The detachable output/input sockets are also replaceable with different plug adapters for use with the different power plug standards around the world.