A metal mesh, a touch display device, and a method for reducing moire pattern in a touch display device are provided. The metal mesh includes at least two first metal lines which are arranged in parallel and separated from one another, and at least two second metal lines which are arranged in parallel and separated from one another and intersect the at least two first metal lines. The first metal lines and the second metal lines have a width of 1-6 μm, an the intersection angle between the first metal lines and the second metal lines is 66-70 degrees, and a distance between two neighboring first metal lines and a distance between two neighboring second metal lines are 160-170 μm or 200-210 μm.