Abstract: In this research, jackfruit peel cellulose was modified by alkalization, etherification and amination to prepare dye adsorbent for removal of Congo red and methyl blue dyes. The influences of adsorbent dosage, reaction time, reaction temperature, reaction pH and initial dye concentration on the adsorption properties of modified jackfruit peel cellulose adsorbent were investigated by batch adsorption experiment, and the adsorbent was characterized by Fourier transform infrared spectroscopy, X-ray diffraction, scanning electron microscopy and simultaneous thermal analyzer. The results showed that the modified jackfruit peel cellulose adsorbent had good adsorption ability for Congo red and methyl blue. The influences of adsorbent dosage, reaction time and reaction temperature on the adsorption rate of the two dyes first increased and then maintained stable, but the influences on methyl blue was less than that on Congo red. The increase of pH value resulted in a decrease in the adsorption rate of Congo red and a increase in the adsorption rate of methyl blue. The higher the initial concentration of dye, the lower the adsorption rate of the adsorbent to the dye. Characterization results showed that etherification and amination reactions took place on the jackfruit peel cellulose during modification and the crystal form and crystallinity of cellulose was changed. The surface of the modified cellulose became smooth with many folds and exposed porous structures, and the thermal stability of cellulose improved.