The deep-sea CDOM sensor is based on fluorescence measurement technology. It utilizes an ultraviolet light source to excite chromophoric dissolved organic matter CDOM in the ocean, causing it to emit fluorescence signals within specific wavelength bands. By detecting changes in fluorescence intensity, the sensor achieves precise inversion of CDOM concentration. With technical advantages such as high detection sensitivity and fast response speed, it is compatible with mobile observation platforms like Argo floats and underwater gliders, as well as fixed monitoring equipment such as moorings and shipboard water samplers. This enables multidimensional and high-precision observation of CDOM concentration in deep-sea profiles, providing crucial technical support for marine carbon cycle research and ecological environment monitoring.