The invention discloses a method for hydrolyzing titanium pigment, which comprises the following steps of: preheating a heavy titanium solution and bottom water to certain temperature; when the heavy titanium solution is added into the bottom water, continuously and evenly adding a regulator into a hydrolysis mixture; after the titanium solution is totally discharged, preparing metatitanic acid by hydrolysis; and obtaining the titanium pigment by the subsequent procedures.