The invention discloses a method for producing precipitated calcium carbonate and white carbon black coproduction sodium chloride and powdered carbon, which comprises the following steps: using coproduction alkali waste liquid and carbide slag as raw materials; firstly, using ammonium chloride in the coproduction alkali waste liquid to react with calcium hydroxide in the carbide slag to produce carbon filter cake, calcium chloride and ammonium hydroxide; placing the calcium chloride and the ammonium hydroxide into a carbonizing tower, and introducing carbon dioxide gas for carrying out carbonizing reaction; and making the produced calcium carbonate precipitates and the ammonium chloride solution react with water glass to obtain the white carbon black and the sodium chloride. The method uses the industrial waste products of coproduction alkali waste liquid and the carbide slag to produce the calcium carbonate and white carbon black coproduction sodium chloride and powdered carbon, fully utilizes the active ingredients in the industrial waste products, reduces the production cost of industrial products, has simple production process and very low production cost, and belongs to an economic and effective method.