Platform building limit laser measuring instrument

The utility model provides a platform building clearance laser measuring instrument which comprises a supporting rod, a limiting assembly, pulley assemblies, a movable sliding table module and a laser ranging module, a first limiting support and a second limiting support of the limiting assembly are used for abutting against the inner side of a train track in the working process, and the pulley assemblies are connected with the two ends of the supporting rod respectively. The laser ranging module is placed on a train track in a working state so that the measuring instrument can slide along the train track, and the laser ranging module is connected with the movable sliding table module and used for measuring the height and width of a platform. According to the platform building clearance laser measuring instrument provided by the utility model, the laser ranging module can measure the height and the width of a platform, and the measuring instrument can move on a train track, so that data measurement of all mea