The random and disorderly charging of a large number of electric vehicles will cause certain negative effects on the operation safety of the power distribution network and increase the peak-to-valley ratio of power grid. According to the concept of vehicle-to-grid (V2G), the present paper proposes the micro-grid dynamic price adjustment strategy to guide the orderly charging of electric vehicles. The results of experimental simulation show that the regulation and control of dynamic price adjustment strategy can guide vehicles to participate in orderly charging regulation and charging controlling. At the same time, the strategy can satisfy various needs of charging customers and increase the responsiveness to emergency charging event.