The invention discloses a cable subsurface 
buoy real-time 
internal wave monitoring device. The device comprises a power supply, an industrial 
personal computer, a steel cable, a customized cable and a plurality of 
internal wave measurement probes, wherein the plurality of 
internal wave measurement probes are all composed of 
conductivity temperature depth systems and current needles, the customized cable is connected with the power supply and the industrial 
personal computer respectively, the plurality of internal wave measurement devices are arranged on the customized cable, and spaces are kept among the plurality of internal wave measurement devices, the customized cable is fixed on the steel cable, one end of the steel cable is fixed on a 
deck of a ocean platform and the other end is movably connected with a weight, and the customized cable is fixed on the 
deck of the ocean platform by an inclined steel cable. According to the invention, the internal wave monitoring device is constructed based on the ocean platform, so that the cable subsurface 
buoy real-time internal wave monitoring device installed on ocean platform is not easy to steal and lose, the safety of the 
measurement device is ensured; the real-time power supply of the 
measurement device and real-
time data collection can be achieved; and compared with a self-contained subsurface 
buoy internal wave monitoring device, the cable subsurface buoy real-time internal wave monitoring device installed on ocean platform is greatly improved in the timeliness of data.