The utility model relates to the underwater robot field, and especially relates to a myriametre ARV optical fiber system. The system comprises a water surface control panel, a heave compensation device and an optical fiber connection system. The water surface control panel is used for real-time display of image information collected by an underwater camera. The system employs a gravity block and a neutral buoyancy block device, can compensate heaving motion of a mother ship and prevents winding of optical fibers. two optical fiber ball release mechanisms has characteristics of small size and low cost compared with an optical fiber winch release system and has a certain anti-interference capability to ocean currents. When an optical fiber is affected by ocean currents and the tension force of the optical fiber is increased, the mechanism can lower influences of ocean currents to ARV carrier navigation, and prevents the water surface optical fiber joint from snapping due to too large tension force effectively. The system has universality, and is suitable for underwater robots with different types.