The utility model provides a handheld patrol inspection auxiliary device for transformers in a substation. The handheld patrol inspection auxiliary device comprises an LED flashlight, a variable-focus camera, a telescopic rotating module, a display module and a control module. Through the adoption of the handheld patrol inspection auxiliary device, the height and the angle of the camera can be adjusted through operation of the control module, so that patrol inspection personnel in the substation can conveniently know the working conditions of the transformers comprehensively; moreover, camera lens zooming in can be realized through the focal length setting, so that the electricity meter values of the transformers can be read more accurately; the potential safety hazard is avoided when the patrol inspection personnel observe the transformers at short range, and the patrol inspection safety is improved to a certain extent.