The invention relates to an intelligent vehicle standby power system which is composed of a standby power source, a switch, an insulated-gate bipolar transistor high-speed switch and a controller. Electric quantity of a vehicle storage battery can be monitored, a low-voltage warning function is achieved, and when the storage battery is in severe lack of electricity, the standby power source can be used to complete starting of the vehicle, and the storage battery in severe lack of electricity can be repaired and returned to a state of full recharge. The intelligent vehicle standby power system has the advantages of small size, light weight, convenience in mounting and the like.