On-line automatic measuring device for thickness of slab

The utility model provides an on-line automatic measuring device for the thickness of a slab, which comprises a roller way base and a plurality of roller ways arranged on the roller way base. The device is characterized by also comprising a detection framework fixed on the roller way base. The detection framework is provided with a cylinder. The end of the piston rod of the cylinder is fixedly provided with a roller seat. The roller seat is provided with a measuring roller. The measuring roller is arranged facing the roller ways. The cylinder body of the cylinder is internally provided with a displacement sensor for measuring the movement distance of the piston rod of the cylinder. According to the technical scheme of the utility model, the thickness of a slab can be measured by the device, instead of the traditional manual measurement. Thus, the generation of omissions and errors due to human factors is reduced and the labor cost is saved. The measuring accuracy and the production efficiency are improved.