The utility model provides an automatic patrol system of a transformer substation. The automatic patrol system comprises a host, a video monitoring unit, an environment monitoring unit, a safe defense unit, a fire alarm unit, an entrance guard unit, a state monitoring unit and a multi-dimension display unit. The video monitoring unit, the environment monitoring unit, the safe defense unit, the fire alarm unit, the entrance guard unit, the state monitoring unit and the multi-dimension display unit are connected with the host. The automatic patrol system has the advantages that the multiple units are arranged for monitoring multiple objects, automatic patrol and intelligent analysis are achieved, and monitoring quality is guaranteed.