Distribution network complexity increases. This, along with the number of new switchings results in the frequent changes of network topology. Traditional verification method is difficult to meet the requirements of rapidity and accuracy. In this paper, an online verification method of medium and low voltage distribution network topology based on a model file and the correlation of measured data is proposed. First, the topology model file of the distribution network design drawing is used as the verification basis, and a simplified model is established by analyzing the switching state. Secondly, a hierarchical clustering method is used to divide multiple power supply areas. Then the Pearson correlation coefficient algorithm is used to verify the correlation of the measured data of each node in the same power supply area, so as to judge the correctness of the topological connection relationship of the model. Finally, the feasibility and effectiveness of the proposed method are verified by simulation and actual case calculation. This work is supported by the Science and Technology Project of State Grid Corporation of China (No. 521997190014) and the National Natural Science Foundation of China (No. U1766208).