The utility model discloses a centrifugal machine experiment device suitable for the many-year service state of a roadbed in a cold region. According to the utility model, a plurality of groups of second heat exchange devices are additionally arranged in the model box, and by controlling the second heat exchange devices, the phenomenon of differential settlement caused by temperature change of different positions of a widened roadbed in a cold region due to illumination is simulated; according to the device, the laser displacement sensor is adopted to monitor test soil, so that the interactionbetween a measuring element and a roadbed during freezing and thawing cycle is avoided, the experimental data error is reduced, and the experimental data is more accurate and reliable; a C-FBG sensoris adopted, so that migration change characteristics of frozen soil roadbed water can be detected; according to the device, the multi-year service state of the widened roadbed in the cold region canbe more accurate, and more complete and comprehensive monitoring is realized; the whole system is simple and convenient to process, install, maintain and use.