The invention provides a distributed four-wheel drive pure electric vehicle electrical system. The system comprises a power battery pack, a battery management system, a high voltage distribution box, an adapter junction box, a vehicle-mounted charger, a DCDC, an air-conditioner compressor controller, an air-conditioner compressor, a PTC, an electric controller, a motor, wheels, a remote monitoring system, a vehicle control unit, a storage battery, an ignition switch, a combination meter, a vehicle body module controller, lamplight, a low-voltage power supply relay and a high-voltage power supply relay, wherein the low-voltage power supply relay and the high-voltage power supply relay work in cooperation with the other components. The system further comprises a high-voltage direct current bus and a low-voltage output circuit for connecting the other components. According to the pure electric vehicle electrical system, some new electrical systems and devices are added, an original low-voltage circuit is modified partially, and the independent wiring mode is adopted for the newly-added electrical system, so that the whole electrical system is reliable to use and easy and convenient to operate.