The invention provides a uniformity measurement method used in a cloth thickness measurement device in order to avoid a defect that a cloth purchaser cannot quickly and accurately discriminate the cloth quality of cloth printed or sprayed with complicated patterns or patterns with very small fringe spacing when purchasing the cloth. The uniformity measurement method comprises the steps of (1) arranging cloth to be detected on a one-way moving conveyor belt, wherein the moving direction of the conveyor belt is consistent with the length direction of the cloth; (2) arranging a plurality of marks extending in a mode of being perpendicular to the cloth surface on the cloth to be detected; and (3) acquiring a cloth reference image with shadow of the marks, and determining whether the cloth patterns are consistent or not according to the cloth reference image. The uniformity measurement method overcomes a defect that a lot of image processing time and image processing machine resources are required to be consumed by an image analysis algorithm generally adopted and depended in the prior art, and can realize detection on the cloth pattern consistence quickly and accurately.