To ensure stable output of charging power at the charging station, this study designed an intelligent optimization method for charging power of electric vehicle charging stations based on VSM. Firstly, the circuit topology of the electric vehicle is analyzed in depth, and the power demand and variation characteristics during the charging process are clarified. Then, based on VSM theory, an optimization model of electric vehicle charging power is established. This model can comprehensively consider the operating parameters of the charging station and the charging demand of the electric vehicle, and realize the intelligent distribution of charging power. Finally, a three-phase balance optimization charging power regulation strategy is proposed to ensure the balance of three-phase current during the charging process, and to minimize resource waste by improving charging efficiency. Through testing and verification, it was found that the deviation of grid frequency was significantly reduced after applying this method. When the frequency deviation of the power grid increases from 0 to −1.5 Hz, the active power absorbed by the power grid decreases from 15.0 kW to 13.5 kW, a decrease of 10%. However, during this period, the output power of the load remained at 15.0 kW, indicating that this method can maintain stable power output under different input voltages.