The invention discloses a soilless nutrient medium for ore sand and an ecological repair method for a closed nonferrous metal tailings pond. The soilless nutrient medium for ore sand is prepared by adding the following components in parts by mass: 0.06-0.12 part of an aggregate polymerizing agent, 0.12-0.22 part of a water-retaining agent, 0.06-0.12 part of a binder, 1.4-5 parts of a fibrous material, 0.18-0.3 part of a long-acting compound fertilizer, 7-27 parts of humus and 0.18-0.32 part of mixed seeds to obtain the soilless nutrient medium for ore sand by taking tailings pond mud of the closed nonferrous metal tailings pond as a final covering raw material. The repair method comprises the following steps: uniformly stirring the soilless nutrient medium for ore sand with a hydraulic spraying and sowing trolley to the surface of the tailings pond; and finally, ecologically repairing the closed nonferrous metal tailings pond. The repair cost is low, the spray layer is stable, a plantgrowth layer formed by drying the spray layer has a good water absorption water-retaining property, water obtained by rainfall can be stored for a long time for the demand of plant growth, and moreover, the growth layer has relatively good structural toughness, and is hardly aeolated to lead to flying dust, so that the actual effect of inhibiting flying dust is achieved.