The invention discloses a residue removing device for cotton linters. The residue removing device comprises a shell, and a feed hopper located on one side of the top of the shell. The bottom end of the feed hopper stretches into the shell, a baffle is arranged on one side of the feed hopper, a feeder is installed at the bottom end of the feed hopper, and a cotton linter cutting device is arranged between the feed hopper and the feeder. The cotton linter cutting device comprises a second cutting rotor and two first cutting rotors, the first cutting rotors and the second cutting rotor are movably installed on the side wall of the shell, tool bits of the first cutting rotors carry out mutual cutting, the second cutting rotor is located below the position between the two first cutting rotors, guide plates are arranged on the two sides of the second cutting rotor, the guide plates are obliquely installed on the inner wall of the shell and the baffle, and a licker-in installed on the inner wall of the shell is arranged on one side of the feeder. The residue discharge effect of the cotton linters is improved, the situation that a large amount of dust is generated during residue removal to contaminate the cotton linters again is avoided, and the impurity discharge amount can be adjusted.