The invention discloses an intra-residential area electric vehicle charging system and method based on the flexible load of a demand side. The intra-residential area electric vehicle charging system comprises a residential area flexible load charging management system, which is connected with an application server, a database server, a front server and a register server respectively, wherein the front server is connected with a plurality of mobile terminals, and the register server is connected with a plurality of charging piles and a plurality of energy storage cabinets via a large concurrent load balance server; and the residential area flexible load charging management system is used for, at the electricity consumption trough of a residential area, pushing real-time electricity price to the mobile terminals to remind users of purchasing, acquiring electricity from a residential area grid and storing the electricity into the energy storage cabinets, and at the electricity consumption peak, reminding the users whether to preferentially charge electric vehicles with low-price electricity stored in the energy storage cabinets. The system and the method realize bidirectional interaction on the two aspects of an electric vehicle charging demand side and a grid supply side, realize flexible and dynamic load adjustment, reduce the electricity consumption cost, also guarantee the stable load of the grid, and thus have good social benefits.