The invention relates to an electric vehicle charging station planning method and system. The method comprises steps: the city is divided into regions with equal side lengths; the traffic index of each region is determined according to vehicle GPS trajectory data of each region and UGC departure and destination data, and the traffic index of each region is subjected to normalization processing; according to the number of charging stations in each region and the utilization rate of a charging pile in a charging station, the utilization rate index of a charging facility in each region is determined; according to the traffic index of each region after normalization processing and the traffic index of each region, a charging station construction demand index in each region is determined; and according to the charging station construction demand index in each region, a charging pile mounting region is selected. According to the technical scheme provided in the invention, analysis is carriedout based on the regional traffic index and the existing charging station utilization rate condition, a scientific and reasonable optimal site selection result is obtained, and the charging experience of an electric vehicle user is enhanced.