The invention relates to the technical field of zero-emission sewage reutilization and provides a zero-emission sewage reutilization device. A zero-emission sewage reutilization method sequentially comprises steps as follows: miscellaneous salt is subjected to coagulative sedimentation, sodium carbonate is added and calcium carbonate precipitates are obtained; caustic soda is added, and magnesium hydroxide is obtained; membrane filtration is performed, the pH value is regulated, ion exchange softening, advanced oxidation, biochemical treatment with a biological membrane are performed, filtration with a membrane filter and nanofiltration are performed, lime milk is added to interception water obtained through nanofiltration, calcium sulfate is obtained, a supernatant flows back to a miscellaneous salt sedimentation basin, nanofiltration permeate water is concentrated through a reverse osmosis separator A and then is concentrated by a brine concentrator, fresh water produced by the brine concentrator is concentrated by a reverse osmosis concentrator B and flows back to the brine concentrator, concentrated water produced by the brine concentrator enters an crystallizing evaporator and is subjected to hot separation and cold separation, sodium chloride and sodium nitrate are obtained respectively, most crystallization mother liquor is subjected to refluxing treatment, and a small part of crystallization mother liquor is dried; reverse osmosis produced water and distilled water are reused. According to the invention, commercial calcium carbonate, magnesium hydroxide, calcium sulfate, sodium chloride, sodium nitrate salts and high-quality reused water are recycled, emission of solid waste is small, and the operating cost is low.