The invention discloses a distorted image rectification method of back scattering X-ray huma body safety check equipment. The distorted image rectification method comprises the following steps of 1) designing a back scattering X-ray huma body safety check equipment image rectification template RectifyTemplate, and imaging the RectifyTemplate to obtain a to-be-rectified template image Imgori, 2) preprocessing Imgori and extracting the effective imaging region Imgvalid of a human body image, 3) for Imgvalid, firstly, carrying out transverse gray accumulation and mean-value projection calculation in a horizontal direction and performing minimum on gray accumulation in each row and a mean value curve, 4) rectifying in the horizontal direction with reference to the width of the row of pixels Centrecow in the widest position in the horizontal direction of Imgvalid, and 5) rectifying in the vertical direction with reference to the width widthcow of a grid in the horizontal direction at Centrecow on the basis of Imgrec_h. The distorted image rectification method realizes effectively rectification of the distorted image so that the visual effect of the image is greatly improved; the scale of the rectified image is well united with the scale of the shape of the human body, and therefore, a good foundation is laid for the security personnel to interpret images more effectively and accurately.