The invention discloses an acid soil conditioner, which is made from the following raw materials, by weight part, 9-11 of plant ash, 2.6-2.8 of apatite powder, 10-12 of golden needle mushroom residue, 5-6 of pod powder, 30-34 of bagasse, 1.6-1.8 of magnesium sulfate, 4-5 of potassium nitrate, 3-4 of lime powder, 65-70 of polluted pig dung and urine, 12-15 of a black liquor from papermaking, 3.6-3.8 of a nitric acid solution with the concentration being 10%, 11-13 of a thick alum liquid and a proper amount of water. In the soil conditioner, alkaline raw materials, such as plant ash, are adopted and match thoroughly-decomposed materials including processed pig dung and urine and bagasse, and therefore salt in the soil can be well neutralized. Alkaline-earth metal, such as magnesium sulfate, is added and matches golden needle mushroom residue for prompting activity of rhizosphere microorganisms, prompting insoluble mineral elements in the soil to change into soluble nutrients, and preventing manganese and aluminum damage to the soil. The available phosphorus content is the soil is further increased, and the obstacle of phosphorus deficiency is overcome under the function of application of apatite powder, and the problem that acid soil is low in planting yield is solved.