The present invention is a light-duty enhanced tray-type bridge frame, which consists of two side plates (2) and a plurality of bottom plates (1). The bottom plate (1) is located between the two side plates (2), and along the side plates (2) A plurality of pieces are spliced continuously in the inner length direction to form a bridge frame. The width of the bottom plate (1) is cut according to the specifications of the bridge frame. The cutting angle of the bottom plate (1) is obliquely cut, that is, the width of the upper plane in the transverse direction of the bottom plate (1) is greater than the width of the lower plane , so that the transverse width of the bottom groove (12) is smaller than the width of the protrusion (11), so that there is a certain gap (3) at the bottom connection between the bottom plate (1) and the side plate (2), and finally the bottom plate (1) and the side plate Plate (2) is assembled and welded into a whole. Compared with existing products, it is light in weight, high in strength, easy to process, eliminates cumulative errors, and the splicing parts are not easily deformed. It solves the problem of zinc liquid deposits in the groove of the bottom plate during hot-dip galvanizing, is not easy to accumulate water at the bottom, and has high resource utilization. .