Coproduction process of activated carbon and silica with rice husk as raw material was studied. The carbonized rice husk was first treated by acid and alkali, the obtained solid residue was further activated to make activated carbon, and the sodium silicate solution was precipitated to prepare silica. The results showed that the specific surface area of activated carbon was 961.8 m2/g, and adsorption capacities of iodine and methylene blue were 1270 and 300 mg/g. Compared with such parameters of activated carbon from carbonized material without deashing, the specific surface area and total pore volume were increased by 136% and 103.8%, respectively. The optimal conditions for making silica were obtained as 10%(j) HCl and 2.5 mol/L NaOH in pretreatment and further calcination at 600℃. The particle size of obtained silica was about 40~60 nm with an amorphous structure. Its maximal specific surface area was 330 m2/g and purity 99.84%, respectively.