The invention relates to a phosphoric acid production technology adopting a two-step method and a dihydrate wet method. The phosphoric acid production technology comprises the following steps: primaryreaction, primary crystallization, primary filtering, secondary reaction, secondary crystallization and secondary filtering. A high-concentration finished product phosphoric acid filtrate and a high-quality byproduct phosphorus gypsum are obtained through controlling a technological index of each step. The phosphoric acid production technology has the advantages of strong phosphorus ore adaptability, stability in operation and high working efficiency. According to the phosphoric acid production technology, the concentration of P2O5 in the finished product phosphoric acid filtrate is improvedand reaches 28 weight percent to 32 weight percent; the concentration energy consumption of a phosphoric acid product is reduced; furthermore, the content of the total P2O5 in the discharged byproductphosphorus gypsum is lower than 0.6 percent, the content of water-soluble P2O5 is lower than 0.25 percent and the phosphorus recovery rate reaches 98 percent. The harmless treatment and stacking canbe realized after the obtained phosphorus gypsum is neutralized through less limewater and the comprehensive utilization cost of the phosphorus gypsum is greatly reduced.