Switching management device and switching management method for vehicle-mounted power supply

The invention discloses a switching management device and a switching management method for a vehicle-mounted power supply, which can flexibly select to connect or disconnect a power supply access asrequired; an original storage battery of a vehicle is charged preferentially in a starting state of an engine of the vehicle, and a special storage battery charging function is not started only when the original storage battery of the vehicle is full of power. The original storage battery charging capacity of vehicle is preferentially guaranteed; meanwhile, the generator is prevented from chargingthe two storage batteries at the same time with large current, and the load of the generator is increased. After the engine of the vehicle is shut down, an equipment power supply is automatically switched to the special storage battery, and the power input path of the charging circuit and the power supply path of the generator for the equipment are disconnected, so that the equipment is preventedfrom consuming the power o