The invention discloses an asphalt concrete texture laser measuring instrument, relating to an asphalt concrete texture measuring instrument. The invention aims at solving the problems that an existing sanding method is easy to block a gap on the surface of a test piece by sand, not conductive to perform repeated measurement on a pavement and low in measurement precision. A lifting rotating mechanism is arranged in a host machine box body, a laser testing device is mounted on the upper end surface of the host machine box body through two upright posts, a detection platform is mounted on the lifting rotating mechanism and is positioned between the two upright posts, a plurality of elastic positioning pieces are fixed on the detection platform, a sliding track is horizontally and fixedly mounted at the upper ends of the two upright posts, a pulley block is arranged on the sliding track by penetration, a laser probe is mounted at the lower part of the pulley block, a first fluted disc is mounted on an output shaft of a first servomotor, a second fluted disc shaft is mounted on the remaining upright post of the two upright posts, a second fluted disc is mounted on the second fluted disc shaft, a synchronization chain is mounted on the first fluted disc and the second fluted disc, and the pulley block is connected with the synchronization chain. The laser measuring instrument disclosed by the invention is used for measuring asphalt concrete textures.