The invention discloses a method for preparing titanium white by spray hydrolysis, which mainly comprises the following steps of: preparing high purity titanyl sulfate solution, carrying out spray hydrolysis and calcination to the solution, cooling in the air and undergoing ramon, gas powder and post-treatment to obtain the titanium white product, rectifying and separating the calcined tail gas to obtain high concentration waste acid and acidic wastewater to be returned to the main process to be recovered and reused. The method aims at overcoming the disadvantages of the sulfate process titanium dioxide liquid-phase hydrolysis such as intermittent operation, large quality fluctuation among batches, non-uniform microscopic components, low acidolysis concentration of the waste acid, large quantity of acidic wastewater and the like. The method has the advantages of continuous operation, short process flow, few pollution and stable product quality.