The invention relates to the field of mechanical design, in particular to an intelligent human body size measuring device which comprises a clothes body. The clothes body is composed of a clothes inner layer, a clothes middle layer and a clothes outer layer. A human body contour detecting device is arranged between the clothes inner layer and the clothes middle layer, is composed of electronic gyroscopes distributed annularly and can simulate the approximate horizontal contour of a human body. A size measuring device is arranged between the clothes outer layer and the clothes middle layer andmeasures the approximate horizontal circumference of the human body so that a clothes try-on person can rapidly and accurately obtain the size data of himself/herself. By means of the human body sizemeasuring device, with the clothes body as the carrier, the clothes try-on person can obtain the human body size measuring data only by wearing the clothes body, and operation is simple.