The invention provides a measurement method of automatically acquiring outline dimension of human body by shooting human body image with an image acquisition device and analyzing the image through specific algorithm, and relates to a measurement system for implementing the non-contact measuring method. In the invention, a human body is in a shooting room, a two-dimensional image of the human bodyis acquired by an image generator, and the image generator processes the two-dimensional image, generates three-dimensional characteristic points of the human body and eventually calculates the needed human body figure data according to the three-dimensional characteristic points of the human body. Compared with the prior art, the invention directly arranges the marking points for calibrating on a background wall, processes specific algorithm by means of designing a large amount of images and provides a technical proposal that can realize fully automatic physical measurement of the human body, thereby significantly simplifying complicacy of the device and the operation and increasing the consistency and accuracy of the measurement.