The work aims to prepare modified adsorbent through citrus peel residue, to make agricultural w aste an environmentally friendly material. With citrus peel residue, chitosan as raw materials, konjac gum as flocculant, span80 as emulsifier, liquid paraffin as dispersant, modified adsorbent of citrus peel residue was prepared. With bovine serum albumin as simulation wastewater, the effect of citrus peel slag modified adsorbent on adsorption of bovine serum albumin was studied, to explore the effect of adsorption time, temperature and pH on the adsorption, establish adsoption model and analyze the adsorption process. The results showed that the optimal adsorption temperature was 40 ℃, the optimal adsorption time was 2 h, and the maximum adsorption capacity was 293.15 mg/g when the initial concentration of BSA was 1 mg/mL. Preparing modified adsorbent with citrus peel residue which is deemed as agricultural waste can increase the utilization rate of waste during the processing and storage of agricultural products.