The invention provides a VOCs (Volatile Organic Chemicals) zero-emission storage system. The VOCs zero-emission storage system comprises a storage tank, a gas circulating pipeline and a soft gas-storage device used for storing gas in the storage tank. The VOCs zero-emission storage system provided by the invention has the beneficial effects that on the basis of no change of the structure of the existing steel storage tank body, the soft gas-storage device has the characteristics of expansion and shrinkage and replaces the traditional oil-gas breathing valve, so that the oil-gas loss caused by big and small breathing is prevented; the VOCs zero-emission storage system is simple in structure, convenient in machining and installation, low in cost and convenient in use; for the VOCs zero-emission storage system with the soft gas-storage device, the effect of zero emission of VOCs in the process of loading, unloading and storage of oil products is realized, and the problem of volatilization of the VOCs in the process of processing, transportation or storage at places such as oil refineries, oil storage depots or gasoline stations can be effectively avoided.