The invention relates to a cabin stored stone unloading device for a stone rip-rapping ship, especially applied to carrying stones to fill the sea to compose seafood breeding reefs in deep and shallow sea area, characterized in arranging a square open stone storage cabin whose stone outlet is small and top mouth is big, the cabin bottom is provided with stone outlet, the cabin bottom under the stone outlet is hinged with single-fan or double-fan outlet door through loose-leaf, corresponding to the opening position of the outlet door, symmetrically arranging an outlet door opening and closing mechanism on deck, which is composed of steel wire rope, drum, through shaft, reduction box, chain drive, notch wheel, pawl, and clutch rocking handle (or additional sliding steel wire rope and pulley block), corresponding to the middle under the outlet door, arranging an outlet door locking mechanism on deck, which is composed of locking plate, trapezoidal threaded rod, upper and lower nut sleeves, protective sleeve and crank. The invention replaces human labor with mechanisms to discharge stones, saving labor and time, safe and largely reducing labor strength and remarkably raising productivity and increasing economic benefits.