The utility model relates to a CNG power vessel's movable stores up tank, include: tank has a plurality of CNG storage tanks at tank internally mounted, and the one end inside of CNG storage tank is equipped with the ball valve, and the hose is with ball valve and high -voltage tube A intercommunication, a plurality of gyro wheels are evenly installed in tank bottom both sides, and the slide is fixed at the tank rear, and the rail is connected with the slide, and the gyro wheel moves on slide and rail, installs a plurality of fixed blocks at the rail front end and is used for fixed roll. The beneficial effects of the utility model are that: portable tank adopts the mode of directly changing the CNG storage tank to supply fuel for boats and ships, and it is convenient that its operation is stabilized, has effectively reduced the time cost and the cost of labor of conventional air entrainment process, has avoided the potential safety hazard of air entrainment in -process existence simultaneously, portable tank arranges more than the deck that the space is open, trades jar mode simultaneously and has reduced arranging and designing of boats and ships air feed system, removes tank's simple structure, dismantles portably, and the maintenance is more convenient in practical application.