According to digital level barcode''s common characteristics of black and white alternation with different widths, a fast adaptive correlation matching barcode location method is proposed, which is based on equal stripe number and equal width between the matched image and the template image. The barcode grayscale image to be matched is obtained by preprocessing of graying, cutting and correcting of the proposed method. And every time the scale factor of the matched image is obtained according to the assumption of equal strip number and equal width between the matched image and the template image. The image to be matched is transformed to matched image with equal width as the template image using bilinear interpolation method. The matching and precise positioning of barcode are achieved after shift-related operation between the measured image of adaptive scaling and the template image. Leveling measurement experiment results show that this method makes full use of the whole information of barcode image, which has the characteristics of strong anti-interference ability, independence of coding rules, high algorithm efficiency and high precision,which can be widely used for height measurement of barcode level with different coding rules.