The new composite drainage net is a three-dimensional drainage board, composed of upper and lower non-woven fabrics and a central drainage core board. The drainage core board is made of polypropylene and is specially extruded to form a"W"-shaped longitudinal full-section continuous drainage channel. So that the seepage can pass quickly, so as to obtain a good drainage effect. The upper and lower composite two-layer non-woven fabrics play a filtering role, no particles will enter the drainage channel, and the drainage channel will not be blocked, thereby ensuring an ideal soil structure without structural deformation or collapse. Product Features