Abstract: In order to study the effect of different oxidation modification methods of activated carbon on the preparation of silver loaded bactericidal activated carbon, coconut shell activated carbon（AC） was modified with HNO₃ and H₂O₂, and then immersed in AgNO₃ solution. Silver loaded activated carbon（Ag/AC） was prepared by using polypropylene pyrrolidone（PVP） as protective agent and NaBH₄ as reducing agent. The surface morphology of AC were observed by scanning electron microscope（SEM）, the pore structure of AC was determined by nitrogen adsorption at low temperature, the crystal structure of AC was analyzed by X-ray diffraction. The antibacterial properties and silver loss of Ag/AC under different preparation conditions were studied. The results showed that silver ions were reduced to silver nanoparticles with particle size of 10-40 nm and uniformly distributed on the AC surface. With the increase of Ag loading, the specific surface area of Ag/AC decreased, and the bactericidal and anti silver loss properties were improved. Comparing the results of two kinds of oxidation modification, it can be seen that the Ag/AC-H₂O₂ modified by H₂O₂ had the highest silver loading（0.64%）, the best bacteriostatic performance（the bacteriostatic broadband was 4.01 mm）, and the silver loss after 15 days of shaking at 25 ℃ was 0.035%. Ag/AC-H₂O₂ achieved silver controlled release on the premise of maintaining high antibacterial performance.