The invention discloses a method for producing bleaching powder concentrate and activated carbon co-production sodium chloride and sulphuric acid by using waste gypsum mud. The method comprises the following specific steps: after being pretreated, the waste gypsum mud reacts with hydrochloric acid, a mixed solution of calcium chloride and sulphuric acid and a filter cake are obtained by filtration; the filtrate reacts with sodium sulfate to generate pure white plaster deposit and sodium chloride; a sodium chloride solution and a pure plaster filter cake are obtained by filtration; sodium chloride crystal and a sulphuric acid solution are obtained by the slight distillation of the filtrate, and the sulphuric acid solution can be made into concentrated sulfuric acid products by slight concentration; the plaster filter cake continues to react with sodium hydroxide to generate pure calcium hydroxide and a sodium sulfate solution, the sodium sulfate solution can be reused and the bleachingpowder concentrate is obtained by the chlorination, separation, drying and crushing of the pure calcium hydroxide. The method effectively and reasonably utilizes chemical reaction principle to treat waste gas, waste water and waste residues and changes waste into valuables, thus not only saving the cost of treating waste acid, but also creating remarkable economic value. The method can be considered to be canonical in the comprehensive utilization of waste gas, waste water and waste residues, deeply embodies the advantage of circular economy, and simultaneously, greatly improves the deep processing capability of enterprises.