Dust suction device of dust-suction type sander

The utility model provides a dust suction device of a dust-suction type sander, belonging to the technical field of dust-suction type sanders, and solving the problem of a poor dust suction effect of the conventional dust-suction type sander. The dust suction device of the dust-suction type sander provided by the utility model comprises a shell and a hollow handle, wherein a motor is arranged in the shell; a dust suction chamber communicated with a handle channel and a dustproof cover respectively is arranged in the shell; a heat dissipation chamber communicated with the outside of the shell is arranged between the dust suction chamber and the motor; an output shaft penetrates through the heat dissipation chamber and the dust suction chamber, and then is connected with a gear transmission mechanism; a fan capable of enabling airflow in the dustproof cover to flow into the dust suction chamber is arranged between the dustproof cover and the dust suction chamber; heat dissipation blades for performing heat diss