Vehicle-mounted charger with heat dissipation function

The utility model provides a vehicle-mounted charger with a heat dissipation function. The vehicle-mounted charger with the heat dissipation function comprises a main body, a control circuit board, an adapter plate and a heat dissipation fan, wherein the main body is used for being matched with a jack of an automobile cigarette lighter, and the control circuit board, the adapter plate and the heat dissipation fan are arranged in the main body. The adapter plate is provided with a plurality of charging interfaces and a display used for displaying frequency modulation frequency, current and voltage, and the adapter plate and the cooling fan are electrically connected with the control circuit board. The adapter plate and the control circuit board are both located below the cooling fan. An air inlet hole is formed in the bottom of the main body, a heat dissipation hole is formed in the top end, close to the control circuit board or above the control panel, of the main body, and an air outlet of the heat dissipati