The invention relates to a method for producing casein from bean pulp. The method comprises the steps of 1, material mixing, wherein cold-pressed bean pulp and sodium hydroxide solution are prepared into mixed liquor; 2, material reaction, wherein the mixed liquor is heated and then stirred at a constant speed, so that mixed liquor subjected to retting is obtained; 3, mixed liquor filtration, wherein the mixed liquor subjected to retting is centrifugated and filtered to obtain filtrate; 4, neutral reaction, wherein the pH value of the filtrate is adjusted, and then standing is conducted to obtain a sediment A; 5, washing, wherein the sediment A is washed to obtain a sediment B; 6, drying, wherein the sediment B is dried, smashed and screened with a 80-mesh screen, so that the casein is obtained. Raw materials are easy to obtain, production cost of the casein is reduced, operation is easy, and productivity is high.