Air suction type screwdriver

The utility model discloses an air suction type screwdriver which comprises a mounting plate, a motor and a mounting cylinder. A communicating hole is formed in the mounting cylinder; the end, close to the motor, of the installation cylinder is provided with an isolation sleeve. The end, away from the motor, of the installation cylinder is provided with a vacuum part. The end, away from the motor, of the vacuum piece is provided with a suction hole coaxial with the communicating hole and communicating with the communicating hole. A bit is arranged in the communicating hole; a magnetic coupling outer rotor wrapping the outer wall of the spacer sleeve at intervals is fixed to the movable end of the motor, and a magnetic coupling inner rotor is arranged in the spacer sleeve; the end, away from the suction hole, of the bit is fixed to the magnetic coupler inner rotor. One end of the screwdriver head is closed, the other end of the screwdriver head can lock a screw through the suction hole, under the condition tha