The utility model discloses a seepage detection device for hydrate deposits, which comprises a pressure chamber, wherein one end of the pressure chamber is an entrance and the other end of the pressure chamber is an exit. The tip of the entrance and the tip of the exit extend into a first seal cover and a second seal cover respectively, and an entrance pipe and an exit pipe are respectively arranged on the entrance portion and the exit portion. By using the seepage detection device, an absolute permeability, a relative permeability and the relation between the absolute permeability, the relative permeability and the content of each component and the like can be simultaneously obtained; different confining pressures can be provided, and the biggest confining pressure can reach 30 M Pa, so that pressure in the actual stratum can be simulated. The quantities of permeated air and water in holes can be measured through a fine flowmeter. The seepage detection device for hydrate deposits is light in weight, small in volume, convenient to move, and can be conveniently to be put into other measure devices like a CT (computer tomography) machine, a chromatographer and a spectrometer to perform a microcosmic real-time observation.