The invention relates to an electric automobile charging power regulating method and system. The method includes firstly determining scheduling plan power of electric automobile charging power, and then solving actual charging power of various electric automobiles under demand response management according to the scheduling plan power, wherein the scheduling plan power is related to electric load,the higher the electric load is, the lower the scheduling plan power is, the actual charging power is positively correlated to the scheduling plan power, the lower the scheduling plan power is, the lower the actual charging power of the electric automobile is. The charging power is regulated, particularly the charging power of the electric automobile is reduced at the electricity utilization peak, and the charging power of the electric automobile is not limited in the valley of electricity utilization. The system can achieve orderly guide and real-time power control in charging of the electric automobile, reduces charging load to a certain degree at the electricity utilization peak on the basis of the full use of the existing distribution network resources, realizes peak shaving of the power grid, stabilizes the difference between the peak and the valley of the power grid, reduces load fluctuation of the power grid, and improve stability of the power grid.