The invention discloses a battery electric vehicle electrical system mixing high-voltage direct current and high-frequency alternating current. The battery electric vehicle electrical system comprisesfour zones and two power distribution buses which are the high-voltage direct current bus and the high-frequency alternating current bus. Other parts, except for a power battery pack, of a battery electric vehicle are divided according to the spatial positions to form the four zones which are the front left zone, the rear left zone, the front right zone and the rear right zone. Each zone comprises a frequency converter, a hub motor, a high-frequency inverter and an auxiliary equipment assembly. The high-voltage direct current bus is directly connected with the output of the power battery pack, connected with the frequency converter of each zone to supply power to the corresponding hub motor and connected with the high-frequency inverter of each zone to supply power to the corresponding auxiliary equipment assembly, the output of the high-frequency inverter of each zone is connected with the corresponding auxiliary equipment assembly through the high-frequency alternating current bus,and the high-frequency inverters of the four zones are connected in parallel. The battery electric vehicle electrical system has the beneficial effects that the system structure is simplified, and thesystem compatibility is enhanced.