The invention provides a scheduling method and device for electric vehicle charging and discharging stations. The method includes obtaining a current power grid load value; judging whether the current power grid load value is greater than or equal to a preset power grid load upper limit value or not; if the current power grid load value is greater than or equal to a preset power grid load upper limit value, outputting discharge signals used for indicating discharge of electric vehicle batteries. Therefore, the electric vehicle charging and discharging stations can charge and discharge the electric vehicle batteries according to the power grid load condition, peak clipping and valley filling for the power grid load are facilitated and power grid scheduling difficulty at load peaks is reduced.