The invention relates to a method for synthesizing hydrated calcium chloroaluminate, which belongs to the technical field of environmental engineering solid waste utilization. The method comprises theThe invention relates to a method for synthesizing hydrated calcium chloroaluminate, which belongs to the technical field of environmental engineering solid waste utilization. The method comprises the following steps: mixing and stirring municipal refuse incineration fly ash, aluminate cement and deionized water according to the weight ratio of 70:30:33; putting the mixture into a cement incubatorfollowing steps: mixing and stirring municipal refuse incineration fly ash, aluminate cement and deionized water according to the weight ratio of 70:30:33; putting the mixture into a cement incubatorfor incubating for 72 hours under a condition that the humidity is between 95 and 99 percent; and drying and grinding the mixture to obtain micro-particles mainly comprising the hydrated calcium chlo for incubating for 72 hours under a condition that the humidity is between 95 and 99 percent; and drying and grinding the mixture to obtain micro-particles mainly comprising the hydrated calcium chloroaluminate. Through mixed hydration reactions between solid phases under the action of water, a compound with the characteristics of pollutant binding capacity, LDHs special structure, anion exchangeroaluminate. Through mixed hydration reactions between solid phases under the action of water, a compound with the characteristics of pollutant binding capacity, LDHs special structure, anion exchangeability, memory effect, and the like is synthesized. The method provides a new way for the treatment and the disposal of hazardous waste of fly ash, and achieves the effect of treating wastes by wasteability, memory effect, and the like is synthesized. The method provides a new way for the treatment and the disposal of hazardous waste of fly ash, and achieves the effect of treating wastes by wastes simultaneously.s simultaneously.