The invention relates to a controllable large-aperture drainage board filtration fabric making method. The method comprises steps as follows: common fibers, profiled fibers and hot-melt adhesive fibers are mixed and subjected to opening and scutching; a three-dimensional fiber web sprayed with a bonding agent is prepared through dry laying; the three-dimensional fiber web is subjected to needling reinforcement, drying treatment and calendar bonding; the three-dimensional fiber web after cooling is subjected to finishing to form rolls, and a finished product is obtained. According to the method, the profiled fibers and the hot-melt adhesive fibers are adopted as raw materials, the aperture size of the filtration fabric is controlled with the dry laying process, reinforcement is performed with a composite reinforcement process, the drainage board filtration fabric with high longitudinal and horizontal strength uniformity is obtained finally, the strength performance of the drainage board filtration fabric meets the current standard, and the osmotic coefficient of the drainage board filtration fabric meets the expected requirement.