Subsurface buoy system and control method thereof

The invention discloses a subsurface buoy system and a control method thereof. The subsurface buoy system comprises a subsurface buoy body, a floating body assembly and a power supply part. The subsurface buoy body comprises a control device and a broken cable separating device connected with the control device, the floating body assembly is connected with the subsurface buoy body and used for providing buoyancy for the subsurface buoy body, and the power supply part is connected with the broken cable separating device through a first cable so as to supply power to the subsurface buoy body and serve as a mooring device of the subsurface buoy system. Wherein the control device is used for controlling the broken cable separating device to act when the subsurface buoy system meets a cable breaking preset condition, so that the first cable is disconnected from the subsurface buoy main body. By the adoption of the subsurface buoy system, the size and cost of the subsurface buoy are reduced, the underwater safety o