The invention relates to a fired mold manufacturing method which comprises the following steps of: 1. moulding with mould releasing agent; 2. mould grouping; 3. cleaning the mould with a paraffin remover; and 4. sizing. The mould releasing agent comprises the following components in percentage by weight: 0.5-1 percent of polyvinylpyrrolidone with molecular weight of 15,000-40,000, 10-15 percent of polyethylene glycol with molecular weight of 4,000-6,000, 2-5 percent of sodium petroleum sulfonate with molecular weight of 300-500, and the balance of water. The paraffin remover comprises the following components in percentage by weight: 10-15 percent of industrial-grade 9-Octadecenoic acid (Z)-, 2-[bis(2-hydroxyethyl)amino]ethyl ester, 10-15 percent of industrial-grade alkylphenol polyoxyethylene ether, 8-10 percent of industrial-grade fatty alcohol-polyoxyethylene ether, 2-5 percent of industrial-grade lamepon A, 5-10 percent of industrial-grade fatty alcohol-polyoxyethylene ether sodium sulfate, 1-2 percent of sodium carboxymethylcellulose with molecular weight of 6,400+/-100, and the balance of purified water. Compared with the traditional process, the fired mold manufacturing method has the advantages of greatly lowering the manufacturing cost, shortening production time, simplifying process, lightening the labor intensity, increasing labor benefits, and being low-toxicity, low-pollution and high-safety.