The present invention provides a power protection circuit, suitable for vehicle charger, the vehicle charger at least includes a driving source, and the driving source outputs a power voltage to a power protection circuit, the circuit includes a change-over switch, a detecting element and a protection circuit. The change-over switch is used for making on or off the received power voltage. The detecting element is connected to the change-over switch, used for judging whether on or off by whether the detecting voltage higher or lower than a critical voltage. The protection circuit is connected to the change-over switch and the detecting element, for providing voltage limitation protection of the change-over switch and the detecting element. When the detecting voltage is higher than the critical voltage, the detecting element controlling change-over switch shows off state, so as to make the charging circuit which is formed by the power protection circuit and the vehicle charger become to a broken circuit.