Suction-filtration device

The utility model discloses a suction-filtration device, which comprises a suction-filtration bottle, a sand-core funnel, a perforated rubber stopper and a rubber pipe, wherein one end of the rubber pipe is closely connected with a bottle mouth of the suction-filtration bottle, the perforated rubber stopper is closely plugged on a bottle opening of the suction-filtration bottle, the sand-core funnel is inserted into the suction-filtration bottle through the perforated rubber stopper, a glass pipe at the lower end of the sand-core funnel is closely bonded with the perforated rubber stopper without air leakage, a valve is arranged on the rubber pipe and can be used for regulating the speed of suction filtration, and the other end of the rubber pipe is used for being connected with a suction-filtration pump. Through the suction-filtration device disclosed by the utility model, the filtering speed of the sand-core funnel can be increased, and meanwhile, waste liquid is collected, so that pollution is effectively