Charger with automatic cut-off function and using method thereof

In the whole life cycle of mobile phone products, two thirds of power consumption comes from idle consumption caused by mobile phone chargers, namely, power consumption generated when a mobile phone is still plugged onto a socket after fully charged. In addition, if a charger is connected to a power supply for a long time, the service life of components will be reduced, the components will be heated easily, and hidden danger of fire will be caused. The invention provides a charger product which can be automatically disconnected from a power supply when a mobile phone is fully charged or in a standby state, and therefore, hidden danger and other technical problems are solved. The automatic cut-off mobile phone charger comprises an input end, an automatic cut-off function module, a charging function module, a delayed power-off control unit, a current detection function module, and an output end, wherein the input end, the automatic cut-off function module, the charging function module and the output end are connected in sequence, and the output end, the current detection function module and the automatic cut-off function module are connected in sequence.