The invention belongs to the technical field of aluminum hydroxide production and particularly discloses a method for producing multiple varieties of aluminum hydroxide products by adopting solid sodium aluminate as a raw material. The method comprises the following steps: by adopting sodium aluminate as the raw material, preparing a sodium aluminate solution of which the alpha k value is 1.0-1.3, adding aluminum hydroxide seeds, and carrying out decomposition reaction to obtain decomposition raffinate; grading the decomposition raffinate to respectively obtain graded solutions containing aluminum hydroxide in different particle size ranges; filtering each graded solution to obtain aluminum hydroxide crude products in different particle size ranges and various graded mother solutions; processing the aluminum hydroxide crude products in different particle size ranges to obtain aluminum hydroxide products in different particle size ranges; mixing the graded mother solutions; adding superfine aluminum hydroxide seeds; carrying out decomposition reaction, and then filtering to obtain solid phases, namely superfine aluminum hydroxide filter cakes; and processing the superfine aluminum hydroxide filter cakes to obtain superfine aluminum hydroxide products. The method disclosed by the invention is simple in process and capable of producing multiple varieties of aluminum hydroxide products in one time, multiple products are obtained, two stages of decomposition are adopted, and the decomposition rate is increased.