Suction flask convenient for discharging waste liquid

The utility model relates to the technical field of suction filtration flasks, and discloses a suction filtration flask convenient to discharge waste liquid, which comprises a flask body, a liquid discharge hole is arranged on the bottom surface of the flask body, a liquid discharge pipe is fixedly connected with the liquid discharge hole, a round hole is arranged on the liquid discharge pipe, a rotating rod penetrates through the round hole, a ball is fixedly connected with the rotating rod in the liquid discharge pipe, and the ball is fixedly connected with the bottom surface of the flask body. When the suction filtration bottle needs to discharge waste liquid, the rotating rod is screwed to enable the ball connected to the rotating rod to rotate in the liquid discharging pipe, the flowing hole of the ball is perpendicular to the bottle body, the storage tank is movably connected to the lower end of the liquid discharging pipe, and the supporting rod is fixedly connected to the bottom face of the bottle bod