Handheld polishing machine with dust collection function

The handheld polishing machine with the dust collection function comprises a polishing machine body, a dust collection mechanism is detachably installed at the upper end of the polishing machine body, and a cooling mechanism is detachably installed at the lower end of the polishing machine body. When the dust collection device works, air suction operation is conducted through the suction fan in the motor protection bin, then the dust collection head generates suction, the dust collection angle of the dust collection head is adjusted through the telescopic dust collection pipe, and then a dust layer enters the dust collection bin through the telescopic dust collection pipe and the dust collection pipe; dust can be prevented from entering the motor protection bin through a dust filter screen on a butt joint port, after work is completed, the dust collection bin slides in a T-shaped limiting groove formed in the lower end to be removed, and the dust collected in the dust collection bin is removed; and through a