The invention discloses a manufacturing method of high concentration rich superphosphate fertilizer, which comprises: phosphoric acid is used as raw material, steam is steamed to make the temperature of the phosphoric acid reach 55 to 65 DEG C, then phosphorite powder is added to be mixed, the amount of the phosphorite powder is 105 percent of calculated theoretical calculation amount according to phosphoric acid amount, after mixed reaction with the phosphoric acid in a mixer with 30s, 94 percent to 98 percent sulphuric acid is added, the mixed acid of the amount of the sulphuric acid mixed with the phosphoric acid is 62 percent to 68 percent, the sulphuric acid, the phosphoric acid and the phosphorite powder are severely mixed in a reactor for 1 min, material slurry flows into a turning chemical chamber to be solidified, the solidified time is 30 to 40min, the solidified temperature is 95 DEG C, after piling up and curing, powder-shaped material is added with water for pelleting, and the high concentration rich superphosphate fertilizer is obtained after drying and screening. The manufacturing method has the advantages of simple process flow, little equipment, simple and convenient operation, low manufacturing cost and easy realization of industrial manufacture.