Electric wire connecting junction

The utility model discloses an electric wire connecting junction, which comprises an automatic diverter switch consisting of a first wire outlet end, a first wire inlet end and a second wire inlet end, wherein the two wire inlet ends are respectively arranged on two sides of the wire outlet end, the wire outlet end comprises a bottom board, a first contact end, a second contact end and an output end, wherein the first contact end and the second contact end are upwards aslant arranged on the bottom board, the two wire inlet ends are respectively arranged on the outer sides of the first contact end and the second contact end, when the wire outlet end is leftwards inclined, the first contact end and the first wire inlet end are contacted, the second contact segment is further leftwards aslant deviated from the second wire inlet end, and when the wire outlet end is rightwards inclined, the second contact segment and the second wire inlet end are contacted, and the first contact end is further rightwards deviated from the first wire inlet end. The output end is connected on the bottom board. The electric wire connecting junction leads the wire outlet end to be only connect ted with a wire inlet end, can not be simultaneously connected with two wire inlet ends, avoids short circuit of a system, and guarantees safety of a system.