The invention discloses a sweeping and dedusting device of a sweeping robot. The sweeping and dedusting device comprises a shell, a motor and a sweeping device, wherein the sweeping device comprises a sweeping brush, the motor is installed in the shell, the sweeping brush is provided with a connecting shaft, and a driving shaft of the motor is connected with the connecting shaft through a connecting pin and is used for driving the sweeping brush to rotate. The sweeping and dedusting device of the sweeping robot has a great effect on removing obstinate dirt on the ground, and the sweeping and dedusting device is convenient to popularize.