The invention discloses a pressing force measuring device of a transformer winding. The pressing force measuring device is composed of an upper pressing plate, an intermediate pressing plate, a lowerpressing plate, a data processor, a display device, a plurality of screw rods and a plurality of tensile pressure sensors. A transformer winding is arranged between the lower pressing plate and the intermediate pressing plate; all tensile pressure sensors are arranged between the intermediate pressing plate and the upper pressing plate; the lower ends of the screw rods are fixedly connected with the lower pressing plate; and the upper ends of the screw rods pass through the intermediate pressing plate and the upper pressing plate successively and then are connected with adjusting nuts in a sleeving manner. The data processor is connected with the display device and all tensile pressure sensors. The pressing force measuring device is capable of measuring the pressing force of the transformer winding accurately; and distribution information of the pressing force on the transformer winding can be obtained.