Abstract: A reinforcement structure of a paper shredder, which includes a cutter shaft assembly having a cutter shaft and a paper guiding pack located outside of the cutter shaft assembly, with two ends of said cutter shaft being arranged on lateral plates, and with said cutter shaft being provided thereon with a paper guiding plate connected to said paper guiding pack, which reinforcement structure is characterized in that said paper guiding pack is provided on two sides with angle irons wrapping the outside of said paper guiding pack, and two ends of said angle irons are fixed to said lateral plates.