The invention relates to a ketoside solid waste recycling method which specifically comprises the following steps: 1) dissolving solid wastes in a caustic soda solution, and reacting at the temperature of 60-70 DEG C until the pH value is 10-11 so as to obtain a reaction solution I; 2) distilling the reaction solution I at the temperature of 75+/-5 DEG C under the vacuum degree of not more than -0.09MPa until any fraction is not produced, thereby obtaining a product II and a mother solution III; 3) adding a composite oxidant into the mother solution III, carrying out an oxidizing reaction at the temperature of 40-45 DEG C for 2.0-3.0 hours, performing immediate filtration in vacuum, and taking the filtrate V; and 4) adding hydrochloric acid into the filtrate V under stirring conditions until the pH value is 5-6, continuously stirring and reacting for 30 minutes or more, performing suction filtration to obtain the filter residue VI, drying the filter residue VI, thereby obtaining the crude parachlorobenzoic-acid. The method has the advantages that the ketoside solid wastes are recycled, the recycled product is high in economic value, the production cost is reduced, environmental pollution is avoided in the whole production process, and the method is a green chemical process. Moreover, the parachlorobenzoic-acid product recycled from the solid wastes is stable and reliable in quality and high in purity and has excellent economic benefits.