The invention discloses a method and a special device for a hydrate deposit seepage flow test. The device provided by the invention comprises a pressure chamber, wherein one end of the pressure chamber is an inlet, the other end of the pressure chamber is an outlet, the inlet and the outlet respectively extend into a first sealing cover and a second sealing cover arranged in the pressure chamber to be sealed by the end parts, and the inlet part and the outlet part are respectively provided with an inlet pipeline, an outlet pipeline and the like. When the device provided by the invention is utilized, the absolute permeability, the relative permeability and the relationship with the content and the like of each ingredient can be simultaneously obtained, different surrounding pressure can be provided, the maximum surrounding pressure can reach 30MPa, and the pressure in actual stratum can be simulated. The seeped gas quantity and the pore water quantity can be measured through a precise flow rate meter. The device is light, the size is small, the moving is convenient, and the device can be conveniently placed into other measuring devices such as a computed tomography (CT) instrument, a chromatograph and a spectrometer for microscopic real-time observation.