The invention relates to the technical field of marine culture, in particular to a sinking-floating-type marine automated net cage culture system. The system comprises a net cage, hollow piles and a control platform, wherein the hollow piles are annularly arranged around the net cage, a floating ball is fixedly installed at the top of each hollow pile, an inflation core is fixedly installed at thebottom side in each hollow pile, an air flotation cover is fixedly installed at the bottom of each hollow pile, and two three-way water valves are installed at the middle end and the lower end insideeach hollow pile. According to the sinking-floating-type marine automated net cage culture system, an air pump is utilized for pumping up the air flotation covers at the lower ends of the hollow piles, so that the air flotation covers are inflated and expanded to drive the whole culture net cage structure to float up, and thus sinking-floating-type adjustment of the net cage is achieved; througha miniature pump and the water pump, floatage impurities attached to the net cage can be cleaned away, dirt attached to the surface of a camera lens is cleaned away, thus, it is guaranteed that in theculture process, distinct video images inside the net cage can be continuously obtained, and the hygiene of the environment of the net cage can be guaranteed.