The invention relates to an environmental-friendly light partition board produced by waste ardealite and belongs to the techniques of building materials. The partition board comprises an inner interlayer and two outer layers, wherein the inner interlayer is made of polystyrene heat-insulation heat-preservation board, the two outer layers are arranged outside the two surfaces of the inner interlayer, non-woven fabrics are arranged between the outer layers and the inner layer, and the outer layers are made from the following raw materials according to parts by weight: 90 parts of ardealite, 10 parts of magnesium oxide, 35-40 parts of magnesium chloride, 30-35 parts of industrial coal ash, 20-25 parts of crushed crude pearlite, 14-20 parts of kieselguhr, 14-20 parts of saw timber powder and 20-25 parts of magnesite binding materials. The ardealite is waste generated in production process of phosphatic fertilizer enterprises. According to the environmental-friendly light partition board produced by the waste ardealite, the light partition board is free of toxin, odor and radioactivity, and has the characteristics of shock resistance, large compressive strength, heat insulation, fire protection, good sound insulation effect, water resistance, damp proof, and convenience in construction; the light partition board is mounted by plates or in a combined manner, has the characteristics of capabilities in nailing, sawing, digging, adhering, pasting and the like and is flat and unnecessary to be plastered, and the puttying can be directly carried out.