The invention discloses a graph model automatic maintaining method in a distribution network system. The graph model automatic maintaining method comprises the following steps that first, pels of the distribution network system are collected, then a model is established, and the model conducts intelligent layout on the pels through a network topological graph placement algorithm; if pels which are added recently or modified and deleted in the distribution network system are collected, the model conducts automatic adjustment on the pels which are recently added or modified and deleted based on an original layout through the network topological graph placement algorithm, and at last an automatic current operation generates a grid current chart. According to the graph model automatic maintaining method in the distribution network system, devices and lines can be automatically added or modified or deleted, the layout is made to be reasonable, the labor intensity of scheduling personnel is lightened, meanwhile, the working efficiency is greatly improved, and the scheduling operation is made to be timely and accurate.