Abstract: In order to study the effect of bean-processing wastewater in cooperation with lotus leaves hydrothermal carbonization on the characteristics of hydrochar,the bean-processing wastewater and lotus leaves were evenly mixed according to the ratios of their different dry-basis solid mass. The hydrothermal carbonization experiments of the mixture were performed with mass ratio of liquid to total drybasis solid of 10 at 220 ℃ for 10 h. The physicochemical characteristics of the hydrochar obtained were further analyzed. The results show that compared with under pure water condition,the yields of the yields of hydrochar produced from bean-processing wastewater and lotus leaves decrease decrease,the C and N contents increase,and the O content declines. When the mass ratio of dry matter in bean-processing wastewater to lotus leaves increases from 1 to 5,the yields of hydrochar reduce from 34.05% to 31.00%,the C content rises from 58.78% to 66.74%,the mass fraction of O decreases from 26.15% to 16.23%,and the N content is about 3.60%. It provides favorable conditions for its application as electrode material. However,when the proportion of dry matter in bean-processing wastewater increases,the N content in hydrochar does not increase significantly,and the degree of graphitization reduces. The suitable mass ratio of dry matter in bean-processing wastewater to lotus leavesshould be less than 3.