Abstract: An on-board charger with exhaust detection integrates a safety hammer function and an exhaust detection function, realizing a safer automobile life. The on-board charger has a shell. Two on-board charger cathode elastic piece are provided on the shell. The bottom end of the shell is an on-board charger anode. After the shell is inserted into a cigarette lighter socket, the on-board charger cathode elastic pieces and the on-board charger anode are connected with an automobile power supply circuit. The on-board charger anode has an inverted cone structure. The bottom end of the on-board charger anode is the top end of a cone. A ventilation window in communication with the interior of the shell is provided at a position close to the top of the shell. The interior of the shell is provided with a gas sensor for detecting automobile exhaust content. The gas sensor is connected to an alerter. The interior of the shell is provided with a DC-DC voltage transformation circuit.