The utility model belongs to the technical field of bridge project construction, particularly relates to a bridge web formwork manufacturing and mounting ruler and solves the problems that the control of the included angle of a cast-in-place girder web and a base plate and flange plate formwork during bridge project construction wastes labor and time and is prone to failure are solved. The ruler comprises a main rod in a telescopic structure, the lower end of the main rod is hinged to a lower level, a fixing rod II and a foldable lower angle ruler are connected between the main rod and the lower level, the upper portion of the main rod is hinged to a movable rod, and a fixing rod I and a foldable upper angle ruler are connected between the main rod and the movable rod. The ruler is ingenious in design, simple in structure, convenient to carry, reasonable in design, low in cost, easy to promote, multifunctional, time saving and labor saving and convenient and practical to operate, the included angle can be controlled accurately, time and labor are saved, and working efficiency can be improved.