The preservation of cultural relics in museums requires a stable temperature and humidity environment. The temperature and humidity field inspection instrument provides a strong guarantee for the protection of cultural relics. By setting up monitoring points in display cabinets and storerooms, it can grasp the temperature and humidity conditions in real time. For paper cultural relics, unstable humidity can easily cause paper aging and deformation; metal cultural relics are prone to rust in a humid environment. The data of the inspection instrument helps the staff to adjust the temperature and humidity control system in the museum, create an environment suitable for the long-term preservation of cultural relics, extend the lifespan of cultural relics, and inherit cultural heritage.