Novel drainage apparatus for internal medicine

The utility model discloses a novel drainage apparatus for internal medicine. Drainage box, a liquid inlet pipe is arranged at the top of the drainage box; the liquid inlet pipe is connected with a drainage pipe; a liquid collecting bottle is arranged in the drainage box; a funnel is arranged above the liquid collecting bottle; the funnel is positioned below the liquid inlet pipe; a vertical sliding rail is arranged on the inner wall of the right side of the drainage box, a sliding block is arranged on the vertical sliding rail, a transverse supporting rod is fixed to the sliding block, a mounting hole is formed in the left portion of the supporting rod, a funnel is placed in the mounting hole, a liquid stop valve is arranged on the funnel, a vertically-arranged negative pressure cylinderis arranged on the right side of the drainage box, and an airtight door is arranged on the left side. The liquid stopping valve is arranged on the funnel, when the liquid collecting bottle is replaced, the liquid stopping val