Preparation method of cleaning agent for kitchen

The invention discloses a preparation method of a green cleaning agent for a kitchen. The preparation method comprises the following steps: degrading corn starch in water by using high-temperature alpha-amylase, then carrying out graft copolymerization reaction with polyoxyethylene ether methacrylate under the action of an initiating agent to prepare a green starch-based surface active agent, and then compounding with soluble chitosan, sodium tripolyphosphate and sodium carbonate to obtain the green cleaning agent for the kitchen. The green cleaning agent for the kitchen, which is obtained by adopting the method, can be used for cleaning tableware, fruits, vegetables and the like and has the characteristics of good washing detergence property, sterilization, environmental friendliness and the like.