A comprehensive detection method of an electric transformer at and below 35 kilovolts comprises a control panel, a touch screen displayer and an automatic control software system. The parameter which is needed by the automatic detection electric transformer can be achieved by means of wire connection at a time. The comprehensive detection method of the electric transformer at and below 35 kilovolts has the advantages that insulation resistance, infrared, ultraviolet and partial discharge can be measured simultaneously by means of the wire connection at one time, the detection efficiency of the electric transformer is greatly improved, and labor cost can be reduced.