High-precision height measuring device

The utility model relates to a high-precision height measuring device, which comprises a placing box, a scale and a caliper, the scale is formed by sequentially connecting a plurality of scale plates;the middles of one sides of every two adjacent scale plates are hinged through a hinge. Two sliding grooves are formed in the front side and the rear side of each scale plate; a clamping groove and amovable groove are respectively formed in the upper and lower ends of the side wall of one end of the scale plate; one end of the clamping groove extends to the top end of the scale plate; one ends of the movable grooves extend to the bottom ends of the scale plates and correspond to the clamping grooves in the adjacent scale plates in position; the movable groove is provided with a limiting endat the bottom end of the scale plate; clamping blocks are arranged in the movable grooves in a sliding mode, the lower ends of the clamping blocks slide and are embedded into the clamping grooves in the adjacent scale plates, l