The invention relates to drilling fluid screening processing equipment, in particular to a two-layer vibrating screen. The high-performance vibrating screen with the two-layer screen cloth fast to disassemble and replace and capable of working independently comprises a base, a flume and a screen box. An upper screen cloth body and a lower screen cloth body are arranged in the screen box. A backflow device is arranged below the upper screen cloth body and comprises two backflow plates arranged in a bilateral symmetry mode. The left side and the right side of each backflow plate are different in height. A mud channel is formed below the lower side of each backflow plate. The vibrating screen is simple in structure, the single screen cloth body is low in weight, assembling and disassembling are convenient, and cost of replacement after damage is low; the upper screen cloth body and the lower screen cloth body do not interfere with each other, the area of each screen cloth body is doubled, the handling capacity is doubled, and the screening efficiency is improved; the stroke of slurry leaked from the upper screen cloth body is short, blocking can not be caused easily, and power needed by the vibrating screen is reduced.