The invention provides a method for preparing nanometer white carbon black through comprehensively utilizing sodium chloride wastewater. According to the method, with sodium silicate as a silicon source, hydrochloric acid as a precipitator and wastewater rich in sodium chloride as a reaction medium, the nanometer white carbon black is prepared by using a production technology ; meanwhile, the sodium chloride in the wastewater is recycled and utilized; therefore, the production cost is reduced, problems of environment pollution and resource waste caused by wastewater drainage are fundamentally solved, and obvious social and economic benefits are obtained.