Closed switch shell

The utility model belongs to the technical field of switch shells, and discloses a closed switch shell which comprises a shell body, a heat dissipation fan is installed at the top of the shell body, two positioning rods are fixedly connected in the shell body, heat conduction pieces are installed on the opposite sides of the two positioning rods, and the heat conduction pieces are fixedly connected with the heat dissipation fan. According to the utility model, the shell body is used as a main body, the switch circuit board main body is firstly installed on the heat conduction bottom plate, then the shell body is closed, the heat conduction bottom plate is installed between the two heat conduction pieces, and the heat dissipation fan is installed at the bottom of the heat dissipation fan. And heat generated by the switch circuit board main body is transmitted to the heat conduction piece through the heat conduction bottom plate, so that the internal space of the device is completely closed, the switch circuit