The invention relates to a preparation method of a ceramic blank enhancer with decondensation effect on slurry and an application method of a product thereof. The preparation method comprises the following steps of using polysaccharide raw materials, powdery sodium hydroxide, halloysite clay, sodium phosphate, N-hydroxymethyl acrylamide, N,N-methylene bisacrylamide, persulfate and polysaccharide glue as raw materials, stirring, radiating by microwaves, curing by an ultraviolet lamp, heating, crushing, roasting, and cooling, so as to obtain the ceramic blank enhancer product; mixing 0.1 to 0.3 part of ceramic blank enhancer and 100 parts of ceramic blank raw material, so as to improve the anti-fracture strength of the ceramic blank by 20 to 200%. The ceramic blank enhancer has the advantages that the ceramic blank enhancer is applied to the fields of wet and dry-type ceramic preparation; by adopting the preparation method, the drainage of wastewater, waste slag and waste gas is avoided, and the danger to environment is very small, so that the market prospect is broad.