The invention relates to the field of engineering, and especially relates to a contact state monitoring device. The invention provides a contact state monitoring device comprising a package, and the package is disc-shaped and is internally equipped with a sensing optical fiber. In view of the shortcomings of the existing pressure measurement technologies, the invention provides a novel BOTDA-based prefabricated cement concrete pavement contact state monitoring device with a real-time and distributed monitoring function through BOTDA Brillouin Optical Time-Domain Analysis) to meet the need of the prefabricated cement concrete pavement technology.