Anti-suck-back negative pressure suction filtration device

The utility model provides an anti-suck-back negative pressure suction filtration device which comprises a funnel, a rubber plug, a suction filtration bottle, a suck-back cavity, a liquid storage cavity, a liquid outlet pipe, a liquid inlet pipe, a suction pipe, a rubber hose and a vacuum pump device, avoids pollution to filtrate, and is convenient to use in an experiment process. The suction filtration device has the advantages of being simple in structure and convenient to use, facilitating pouring and collecting of filtrate after suction filtration is completed, guaranteeing communication of gas in the device, enabling suction filtration operation to be carried out smoothly and the like, overcoming the phenomenon that suck-back is prone to occurring due to equipment reasons or misoperation in the existing suction filtration experiment and suction filtration process, and improving the suction filtration efficiency. The device solves the problems that water in a vacuum pump is suckedback into a suction flask