Bed raising operation level measuring instrument and method for applying the same

The invention provides a bed raising operation level measuring instrument and a method for applying the same. The measuring instrument comprises a pipeline arranged in the structure of the bed and extending to the surface of the bed, a bracket above the pipeline nozzle, a trigger switch and an alarm fixed on the bracket, and a lifting rope, a pendant and a floating ball in the cavity of the pipeline, wherein the first end of the lifting rope is hung with the floating ball, the second end bypasses the rotating shaft of the bracket and hung with the pendant, the lifting rope is fixed with a trigger switch contact between the floating ball and the rotating shaft of the bracket, the distance between the triggering switch contact and the trigger switch is consistent with the distance between the surface of the bed and the position of a lifted mark, and the trigger switch and the alarm are electrically connected to an alarm circuit. When the raising operation makes the floating ball locatedin the cavity of the cont