The utility model relates to an automatic screwing mechanism. Including a machine frame, a feeding assembly, a conveying assembly, a discharging assembly, a feeding assembly arranged on one side of the conveying assembly and a mounting assembly arranged over the conveying assembly are sequentially arranged over the rack from left to right. Due to the adoption of the technical scheme, the automaticscrewing mechanism achieves the function of automatically screwing a screw on a product through the matching of all the components, is simple in structure and convenient to install, and effectively solves the problem of automatic screwing of the product.