The invention provides a method for preparing an organic/inorganic composite carrier through dispersion polymerization. Raw materials are all added in a mass ratio, and the method mainly comprises thefollowing steps of: (1) adding comonomer, namely divinyl benzene and hydroxyalkyl methacrylate into dispersion of saturated carboxylate at room temperature, wherein the number of carbon atoms of thesaturated carboxylate is 4-7, and third monomer, such as styrene, can also be added; (2) dissolving a stabilizer, polypropylene oxide-polyethylene oxide copolymer in the above system at 20-60 DEG C; (3) adding titanium dioxide particles; (4) adding a radical initiator, and heating the obtained system to 60-85 DEG C for a reaction for 3-12 hours; (4) removing impurities by washing a polymer which is obtained after the reaction, drying the obtained polymer to obtain the organic/inorganic composite carrier containing titanium dioxide. Since the specific dispersion and a dispersion polymerizationmethod are adopted, the method for preparing the organic/inorganic composite carrier is simple and environmentally friendly, and the prepared composite carrier has not only a high pore volume, but also a high average pore diameter.