As a promising new industry, deep blue fishery is the main way to solve the pressing problems of declining inshore fishery resources, insufficient space for aquaculture, low-quality aquatic products and urgent needs for superior animal protein. It has developed rapidly in recent years. But currently the concept and connotation of deep blue fishery is not clear at home and abroad. To further clarify the concept, connotation and characteristics of deep blue fishery, the paper summarizes the background and progress of deep blue fishery at home and abroad, puts forward the concept and connotation of deep blue fishery based on our country’ actual development, clarifies the fact that the deep blue fishery is an organic integrity consisting of sustainable fishing fishery, offshore industrialized green mariculture, high-value aquatic product processing, maritime cold chain logistics and information guarantee services, and expounds the industrial characteristics of the deep blue fishery including whole industry chain integration, high intensity of capital and technology, high risk, high investment and high return and so on, thus laying a theoretical foundation for promoting the construction of deep blue fishery.