A multi-function car charger comprises a housing, a first electrode, a PCB board, a second electrode and a power output port. The car charger further includes a safety hammer, a rear end of safety hammer which is fixed in the housing. The car charger, the safety hammer and other accessories are integrated as a whole to reduce the quantity of car accessories and reduce the occupied space of the car accessories. The safety hammers is placed at a car charger socket where a cigarette lighter is easy to take, thereby attaining the convenience of use.