Artificial intelligence technology has developed rapidly, and inspection robots have been increasingly applied to the inspection work of substations. The electromagnetic environment of the substation is complex, and whether the inspection robot can work normally in a complex electromagnetic environment is a problem worthy of attention. Therefore, this paper establishes an inspection robot model to explore the electric field distribution of the inspection robot during substation operation. The Charge Simulation Method is suitable for the calculation of open domain, and the Finite Element Method is suitable for the calculation of complex boundary problems. Combining the advantages of the two, this paper uses the mixed calculation of Finite Element Method and Charge Simulation method to analyze the electric field distribution around the inspection robot when it’s working. The results of computation show that the electric field around each device is distorted, and the electric field distortion around the top device is the most serious.