Multifunctional molecular biological pipette

The invention discloses a multifunctional molecular biological pipette which comprises a transparent plastic tube, wherein one side of the transparent plastic tube is embedded with a nozzle; one end outside the transparent plastic tube is fixedly connected with a handle; a piston pad is slidably sleeved on an inner side of the transparent plastic tube; one side of the piston pad is fixedly connected with a piston rod; a sealing plug is slidably sleeved to an opening position inside the transparent plastic tube; a sealing sleeve is embedded inside the sealing plug; a surface of the piston rod is slidably sleeved on the inner side of the sealing sleeve; an outer side of the transparent plastic tube is fixedly connected with a threaded seat; and the outer side of the sealing plug is fixedly connected with a threaded ring. Compared with a traditional airbag liquid absorption method, the multifunctional molecular biological pipette has a larger capacity, high liquid absorption and discharging stability and high du