A charging protective circuit is provided with a reverse switching circuit, a battery overcharging detection circuit, and a battery overcharging shunt circuit between a power supply input end and a battery charging circuit. When a rechargeable battery is charged completely, that is, a set charge capacity upper limit is reached, the charging protective circuit can guide a power supply current to another function device circuit disposed on the circuit, for example, an LED display light, a heater, a small motor, or a small device with some functions, so that a voltage of the rechargeable battery during charging is lower than or equal to a set value, it is ensured that a phenomenon of overcharging of the rechargeable battery does not occur, the rechargeable battery is effectively protected, and the service life of the rechargeable battery is greatly prolonged. The charging protective circuit is simple in structure, and uses only a dozen of small power components, so that product performance is improved, and material costs can also be effectively reduced.