Stable vacuum negative pressure system

The utility model discloses a stable vacuum negative pressure system, and relates to the field of vacuum negative pressure equipment. The stable vacuum negative pressure system comprises a mobile equipment frame and a negative pressure vacuum pump, a connecting hose is fixedly installed at the output end of the negative pressure vacuum pump, a control box is installed in the mobile equipment frame and used for controlling the negative pressure vacuum pump, and a detachable hose supporting seat is arranged in the mobile equipment frame; an L-shaped mounting pipe is fixedly mounted at the other end of the connecting hose, a supporting screw rod used for height adjustment is in threaded connection with the interior of the hose supporting seat, and the L-shaped mounting pipe is mounted on the outer surface of the supporting screw rod. When the stable vacuum negative pressure system is used, the end of the connecting hose is kept in a downward hanging state, and the L-shaped mounting pipe is supported through the