The invention discloses an electric vehicle charging station power supply system based on a solid-state transformer. The system comprises an alternating-current/direct-current solid-state transformer, a direct-current power distribution cabinet, a direct-current charging cabinet, a direct-current charging pile, an inverter, an alternating-current charging cabinet, an alternating-current charging pile and other equipment. In the system, a power supply line, where a 400V direct current as a main portion, is set and is connected to a power grid through the alternating-current/direct-current solid-state transformer. During an electric vehicle charging process, an influence of a generated harmonic wave on power-grid electric energy quality is effectively restrained and a power factor is effectively increased so that energy saving and consumption reduction are realized and structures of a power supply system and charging equipment are simplified. Based on that, because of an application of an energy storage unit, a power grid load can be effectively regulated and controlled, which is good for power supply stabilization; and because that the alternating-current/direct-current solid-state transformer and the power supply line where the 400V direct current as the main portion are arranged, access of renewable energy sources of solar energy, wind energy and the like can be convenient.