The utility model relates to a screw thread sleeve pipe upright type inner combusting dual-purpose oil-gas boiler. The utility model uses oil or gas as fuel for positive pressure ventilating, the convection heating surface of the utility model adopts a screw thread sleeve pipe, smoke gas flows in an annular passage of the screw thread sleeve pipe, and the utility model can freely adjust smoke gas flow area and ensure that smoke gas speed is within reasonable range by changing the pipe diameter of the screw thread pipes. Because the inner surface of a coarse screw thread pipe and the outer surface of a thin screw thread pipe are all washed by smoke gas, heating area arranged in unit height is increased. A water space of the utility model is provided with a water-water heat exchanger, and the utility model can simultaneously outwards provide pressure steam and normal pressure hot water (or pressure hot water or normal pressure hot water).