The invention discloses an ANG adsorption storage tank of a double-layer metal structure. The ANG adsorption storage tank comprises a storage tank body with the double-layer metal structure, a natural gas outlet pipe, a relief port, a safety valve, a natural gas inlet and a sewage outlet, wherein the natural gas outlet pipe, the relief port and the safety valve are located on the storage tank body. A heat exchange system and a supporting system are arranged in the storage tank body. Buffering supports are arranged at the bottom of the storage tank body. The supporting system comprises a plurality of round supporting plates arranged at intervals in parallel from top to bottom and a plurality of vertical pipes vertically and fixedly connected between the edges of the supporting plates, and a plurality of heat dissipation holes are evenly formed in each supporting plate. The heat exchange system comprises a phase-change heat storage material arranged between the layers of the double-layer metal structure of the storage tank body in a filling mode and a spiral coil pipe erected in the center of the storage tank body. By arranging the phase-change heat storage material in the double-layer structure in cooperation with cooling water in the coil pipe in the tank, the influence of the heat effect can be effectively eliminated, and the ANG adsorption storage tank has the advantages of being easy to operate, high in vibration resistance, high in safety performance, wide in application range and the like.