Rail tolerance detection device

The invention relates to the technical field of rail tolerance detection of rail-mounted cranes, and provides a rail tolerance detection device comprising a carrier, the carrier is provided with wheels which are connected with a driving mechanism and can automatically run on a first rail, and the carrier is further provided with a first range finder which is used for matching end detection of thefirst rail. According to the invention, the carrier is arranged and is used for installing the wheels and the first range finder; the driving mechanism is used for driving the wheels to walk in the length direction of the first rail, the first range finder measures the distance of the first rail deviating from the center base point at any point in the horizontal plane and the vertical plane, dataare automatically recorded through a data analyzing and processing system, and a rail tolerance curve graph is drawn. According to the rail tolerance detection device, the influence of personnel factors and environmental condi