The invention discloses a charging system. There are at least three charging modules capable of providing power source to two charging interface; working states of a controllable switch and a power source module are determined on the basis of preferentially satisfying the charging demand of a high-priority level output charging opening; at least three charging modules are reasonably distributed to two charging interfaces, so as to maximize the use of a power source system of a pile body, and effectively improve the utilization rate and charging efficiency of the field.