Middle waist line indicating device

The utility model discloses a waistline indicating device and relates to the technical field of roadway construction. Comprising a plurality of middle cords, a movable fixing tube is arranged between the middle cords, a detachable laser indicator is arranged on one side of the fixing tube, a power supply is arranged in the laser indicator, a movable and adjustable clamp is arranged on the rear side of the fixing tube, and the fixing tube is fixed on the middle cords through the clamp. In the actual construction process, constructors need to carry out secondary measurement on the determined center lines to determine the position point of the upper waist of each center line, errors may exist in the measurement process, in addition, a laser indicator on one side of each center line is installed on an existing supporting material of a top plate, installation and debugging are tedious, and the danger of climbing operation is high. The laser designator is placed in the fixing pipe and clamped on the middle line rop