Coagulation effervescent tablet for water purification and preparation method thereof

The invention discloses a coagulation effervescent tablet for water purification and a preparation method thereof. The preparation method comprises the following steps: (1) weighing food-grade poly aluminum chloride, a carbon dioxide source, an acid source, a settling agent and a disinfectant, which are ground into powder and sieved by an 80-mesh sieve, by weight percent; (2) dividing the food-grade poly aluminum chloride into two parts, mixing the first part of the food-grade poly aluminum chloride with the acid source and the disinfectant, adding absolute ethyl alcohol to knead into soft particles, granulating by an 18-mesh sieve, performing drying, granulating by a 16-mesh sieve, performing drying to obtain acid particles, mixing the second part of the food-grade poly aluminum chloride with the carbon dioxide source and the settling agent, adding the absolute ethyl alcohol to knead into soft particles, granulating by the 18-mesh sieve, performing drying, granulating by the 16-mesh sieve, and performing dry