A high pressure hot gas generating device comprises a combustion furnace; an interior of the combustion furnace having a combustion chamber; a lower side of the combustion furnace having an ash exhausting opening; an upper side of the combustion furnace having a high pressure hot gas output tube; a fuel transfer mechanism installed at one side of the combustion furnace and inserted into the combustion chamber for providing solid fuel to the combustion chamber of the combustion furnace; the fuel transfer mechanism can adjust the speed and amount of the solid fuel entering into the combustion chamber; and an air inlet unit installed at one side of the combustion furnace and inserted into the combustion chamber for supplying air to the combustion chamber to be used in the initial ignition; and an ignition unit.