The invention relates to a control method in the V2G micro-grid of electric vehicle by operation of load curve. According to the 24-hour load curve the day before, the average power value of a day and the current battery capacity information of the electric vehicle, the 24-hour operating curve of the same day is calculated through the micro-grid energy management system to be issued to the V2G monitoring system; according to the operating curve, the corresponding control command is generated though the V2G monitoring system and to be issued to the V2G charging pile, and the operating data of the V2G charging pile is constantly read to upload to the micro-grid energy management system; the V2G charging pile implements the control command that the V2G monitoring system issues, so as to charge for electric vehicle or receive the discharging of the electric vehicle to the grid power, and to upload the operating data and the information of the electric vehicle to the V2G monitoring system. The control method in the V2G micro-grid of electric vehicle by operation of load curve has the advantages of achieving the automatic operation and control of the electric vehicle in the micro-grid and guaranteeing that the electric vehicle join V2G micro-grid not only can charge, but also can realize the automatic discharging to the power grid according to the load curve.