Vehicle-mounted charger with external wake-up function

A vehicle-mounted charger with an external wakeup function disclosed by the present invention comprises a vehicle-mounted charger body and a DC converter, the vehicle-mounted charger body comprises a control unit, an input and output unit, a power unit and a low-voltage auxiliary unit, the input and output unit is used for connecting an external alternating current and outputting a direct current to an external power battery, and the DC converter is used for converting the direct current into a direct current; the power unit is used for completing conversion from alternating current to high-voltage direct current to low-voltage direct current, and the low-voltage auxiliary unit is used as an auxiliary power supply; the AC input connector, the input and output connector and the DC output positive electrode connector are respectively connected with the power unit, the signal connector is connected with the control unit, and an external enabling wake-up pin is arranged in the signal connector; a heat dissipation