In order to improve the resource utilization rate of chestnut waste, chestnut burs was used as raw material to explore the extraction process of the active ingredient for inhibiting Shigella dysenteriae. In this experiment, absorbance spectrophotometry was used to compare the antibacterial activity of different solvent extract of chestnut burs. The extraction process was optimized by single factor experiment combined with response surface methodology when antibacterial rate was used as response value and ethanol water was used as solvent. The minimum inhibitory concentration (MIC)of extracts from Chestnut burs were determined by double dilution method, and extracts on bacterial growth curve were compared by absorbance spectrophotometry. The results demonstrated that the ethanol water extract of Chestnut burs had the best antibacterial activity against Shigella dysenteriae. The optimal extraction process was as follow: 45% ethanol as solvent, the ratio of material to liquid was 1:20 (g:mL), extraction temperature 50 ℃; Under the optimal conditions, the antibacterial activity and MIC value of extract from Chestnut burs was 3.2mg /mL, at 0.5 mg/mL The antibacterial rate of extract was 61.27%. The MIC value of ethyl acetate phase extract was 0.4 mg/mL, and the antibacterial rate was 85%, indicating that ethyl acetate phase extract had strong antibacterial activity and was a natural antibacterial agent with great potential for development.