The invention discloses a non-contact measuring method easily obtaining human body data; the method comprises the following steps: setting four grid plates having same scale ruler lines 100*100 around a tested person; detachably fixing the grid plates on a basic frame; placing cameras on grid plate slide rails; adjusting the slide rail height, using a nut to fix the height, and using a holder to adjust the high definition camera lens; using four high definition cameras to measure the tested person body shape information from the front side, the backside, the left side and the right side; reflecting the tested person information on the grid plates having 100*100 scale ruler lines; parsing the images on a computer so as to obtain the tested person characteristic line; obtaining two dimension data of different portions of the tested person according to the grid data, and using a photo measuring method to convert measured two dimension data into three dimensional data.