The invention discloses a charging strategy and system for large-scale electric vehicles distributed in a wide area. The charging strategy for the large-scale electric vehicles distributed in the widearea comprises the following steps: battery information and charging time of the electric vehicles are brought into optimization models of secondary control centers and calculated on the basis of thesecondary control centers; calculation results and predicated output of new energy power generation are brought into a two-stage optimization model and calculated to obtain load guidance curves of the secondary control centers; a charging load following guidance curve of each electric vehicle under the corresponding secondary control center is formulated on the basis of the corresponding load guidance curve; and the electric vehicles are charged according to the charging load following guidance curves. According to the charging strategy and system for the large-scale electric vehicles distributed in the wide area, the strategy of ordered charging load following of the electric vehicles can be embedded into a hierarchical control strategy, and through the hierarchical control strategy, thepurpose of writing cooperation control over the large-scale electric vehicles distributed in the wide area during charging, and clean energy power generation can be achieved, so that a charging behavior for the electric vehicles can be better matched with the intermittent new energy power generation, and then economic benefits and social benefits are created for the society, power grid and electric vehicle operators.