Pipetting device

The utility model discloses a pipetting device which comprises a liquid taking cylinder, the top of the liquid taking cylinder is fixedly connected with a mounting plate, the top of the mounting plate is fixedly connected with a motor, an output shaft of the motor vertically penetrates through the mounting plate and extends to the position below the mounting plate, the output shaft of the motor is rotationally connected with the mounting plate, and the output end of the motor is fixedly connected with a lead screw. A push-pull rod is arranged outside the lead screw in a sleeving manner, the push-pull rod vertically penetrates through the liquid taking cylinder and extends into the liquid taking cylinder, the push-pull rod is in sliding connection with the liquid taking cylinder, a piston is fixedly connected to the bottom of the push-pull rod, the piston is used in cooperation with the liquid taking cylinder, a liquid taking sleeve is fixedly connected to the bottom of the liquid taking cylinder, and a sealin