Plastic drainage boards are made of high-density polyethylene through a special process into three-dimensional sheets with raised or recessed points or holes. They are a new type of geosynthetic material, with one or both sides bonded to a long-fiber non-woven geotextile using a heat press process. The drainage board's unique hollow ribbed structure with raised and recessed patterns allows rainwater to be quickly and effectively channeled away, greatly reducing hydrostatic pressure on the waterproof layer and thereby achieving active waterproofing. These drainage boards can be attached to waterproof materials, concrete, or wood using metal pins, construction adhesives, or double-sided tape, forming an efficient filtration and drainage system.