The invention relates to a method for removing proteins in a chitin material, comprising the steps of (1), crushing the chitin material; adding alkali liquid and a reducing agent to form a mixture; treating the mixture for 0.5-24h in a water bath at 30-150 DEG C; (2), separating solid and liquid of the treated mixture, obtaining the solid, namely, the crude chitin product. The method researches on the indissolvable proteins influencing chitin extraction, the protein dissolvability is increased by adding the reducing agent and the alkali liquid, thereby improving yield and purity of the chitin and providing a new idea for chitin extraction process; meanwhile, the indissolvable proteins are potential protein resources and are beneficial to comprehensively utilizing the raw materials after being transformed into dissolvable proteins.