The invention relates to a non-invasive type winding temperature measuring method for an oil immersed self-cooling pancake winding transformer, wherein a pancake winding temperature monitor and controller of the oil immersed self-cooling transformer is connected with an installation oil surface thermometer, a current transformer and an environmental thermometer for collecting the corresponding data in real time as well as inputting the transformer structural parameter, the winding type and the structure dimension parameter; a heat balance equation between the oil immersed self-cooling pancakewinding transformer winding and the transformer oil is established; and the winding temperature of the oil immersed self-cooling pancake winding transformer is calculated. The non-invasive type winding temperature measuring method for the oil immersed self-cooling pancake winding transformer in the invention is reasonable in design and also considers the situations such as transformer structural style, the pancake winding structure and dimension and the self-cooling heat dissipation manner on the existing basis of measuring the surface oil temperature and the winding current of the transformer, aimed at the characteristics of the oil immersed self-cooling pancake winding transformer so that the winding temperature of the transformer under various working conditions is measured more accurately, which facilitates the transformer operation and maintenance personnel to grasp the running state of the transformer in time.