The invention relates to a point-making distance-marking device for marking the distance between the steel bars of a road bridge to solve the problem that a traditional point-making distance-marking device is liable to damage and unclear in marked points. The point-making distance-marking device includes a vehicle body, wherein a material box is mounted on the vehicle body; a side wall of the material box is provided with a fixing block; a piston cavity is disposed in the fixing block; a vertical rod which can be ejected downward is installed in the piston cavity; a slidable piston is mountedon the vertical rod; a horizontal first through hole is disposed on the vertical rod; the piston slides relative to the vertical rod to close or open the first through hole; the vertical rod has a second through hole therein communicating with the first through hole; a plurality of liquid inlet holes are formed in the side wall of the fixing block; the outer wall of the material box is provided with a rotatable annular sleeve; and the side wall of the annular sleeve is provided with a notch. The point-making distance-marking device is clear and obvious in marking, less likely to damage, low inmaintenance cost, and long in service life, can adjust the distance steplessly, and is small in size, easy to carry, and convenient to use.