Paper shredder capable of working for a long time

The utility model discloses a paper shredder capable of working for a long time. The paper shredder comprises a shell, a paper shredding mechanism arranged in the shell and a motor mechanism for driving the paper shredding mechanism to shred paper, wherein the motor mechanism comprises a turbine fan, a connecting pipe, a motor and an air outlet housing, an air inlet is formed at the tail end of a machine shell of the motor and is surrounded by the connecting pipe at the tail part of the machine shell of the motor, the turbine fan is arranged in the connecting pipe and is connected with a motor rotating shaft stretching out of the tail end of the machine shell, a plurality of air outlets are formed at the front part of the machine shell of the motor, and the air outlet housing is sheathed on the air outlet. The working time of the paper shredder can be effectively prolonged to reach more than two hours, and heat balance can be achieved even when the paper shredder works, therefore, the paper shredder can continuously shred paper and provide a possibility of meeting the demands of customers having high requirements.