To solve the waste of biomass resources and the accumulation of by-product charcoal in the processof biomass pyrolysis. Ｒice straw was used as raw material to prepare straw activated carbon by solid-phaseactivation，and the structure of activated carbon and the adsorption performance of H2S were compared andanalyzed. The results showed that when sodium hydroxide was used as an activator，when the carbonizationtemperature was 450℃，the activation temperature was 700℃，the material ratio was 1∶2，and the activation timewas 60 min，the adsorption time of H2S on the prepared straw activated carbon could reach 86 min. In order toenhance the adsorption performance of activated carbon，urea was selected to conduct secondary activation of strawactivated carbon by hydrothermal method. The results showed that the adsorption effect was best when the activationtemperature was 120℃，and the material ratio was 1∶ 1 ( mass ratio) ，and the adsorption of H2S could reach 130min. The analysis shows that the straw activated carbon reactivated by urea has a complex pore structure and theeffect of doping nitrogen-containing functional groups，and these factors are conducive to the adsorption of H2S.