To improve the intelligent inspection effect of main equipment of converter station, the three-dimensional augmented reality (AR) inspection method of main equipment of converter station is designed. The AR intelligent inspection terminal device is utilized to collect the image information of main equipment of converter station. The three-dimensional inspection scene of main equipment of converter station is constructed through augmented rendering. The inspection scene and image are matched by parameter estimation within the server to complete the positioning of main equipment in the virtual scene. Using series connection of traditional attention module and channel attention module to form a hybrid attention mechanism, the attention matrix composed of weighted feature signals is constructed to obtain the detection results of main equipment operation state, so as to realize the three-dimensional inspection of main equipment of converter station. The test results show that the positioning accuracy of the method for the equipment is higher than 90% and the accuracy of the detection results for different states of the equipment operation is above 0.97, which can effectively collect the data of main equipment of converter station and realize the construction of the three-dimensional inspection scene of main equipment of converter station. The method realizes the three-dimensional inspection operation of main equipment of converter station and has strong applicability.