The invention discloses a vertical curbstone installation straightness measuring instrument, and belongs to the field of municipal construction. The vertical curbstone installation straightness measuring instrument mainly comprises an installation horizontal plate, a first clamping plate and a second clamping plate which are mounted on the installation horizontal plate, wherein the first clamping plate and the second clamping plate are used for being clamped in front and behind a vertical curbstone; a hand wheel and a movement stopping wheel used for stopping the hand wheel from rotating is mounted on the second clamping plate through a fixed shaft; the fixed shaft is horizontally arranged and is vertical to the second clamping plate; a slot is arranged on the second clamping plate, and a sliding jackscrew structure is slidably connected with the slot; and the sliding jackscrew structure is used for fixing the second clamping plate, and is provided with a circular groove for accommodating a rope. The vertical curbstone installation straightness measuring instrument provided by the invention is simple in structure, easy to install and low in cost. Using the measuring instrument to measure the installation straightness of the vertical curbstone is convenient to operate and is high in measurement accuracy. The vertical curbstone installation straightness measuring instrument overcomes the defects of the prior art, greatly improves efficiency and straightness of installation of the vertical curbstone, and is suitable for popularization and use.