Abstract: A multiplex connecting device capable of switching to a single connector includes a first connector, a second connector, and an outer housing assembly. The outer housing assembly includes a first shell and a second shell. The first shell and the second shell respectively cover the outside of the first connector and the second connector. The outer housing assembly can move on the first connector and the second connector, and switch to use a single connector (one of the first connector and the second connector). Accordingly, multiple connectors are integrated into one component.