Dust-less top-and under-fired steam and hot-water boiler

The utility model discloses a smoke dust-less reciprocal burning two-purpose boiler for steam and water. The structure is mainly as follows: a cylindrical internal furnace (24) is arranged on the inner side of a cylindrical barrel body (25) arranged on a cylindrical base (29), the interior of the cylindrical internal furnace (24) is divided into a semi-cylindrical inverse-burning chamber (32) and a positive-burning chamber (33) by a water dividing plate (2), the inner side of the semi-cylindrical inverse-burning chamber (32) is provided with a side inverse-burning fire grate (18), and the inner side of the semi-cylindrical inverse burning chamber is the lower part of the water dividing plate (2). The side of the upper part of the cylindrical barrel body (25) is provided with a cylindrical transverse drum body (6), the side of the upper part of the cylindrical barrel body is the upper side of the positive-burning chamber, a transverse internal furnace (5) arranged in the cylindrical transverse drum body (6) is directly communicated with a burning chamber (31), an inlet of the transverse internal furnace (5) is provided with an upper and a lower partition plates (7), and mutually vertical oblique transverse water pipes (10) are arranged in the transverse internal furnace (5) at the bottoms of the upper and the lower partition plates (7) and a chimney (11). The utility model has the characteristics that combustion is complete, the utility model has no dust and black smoke when smoke is exhausted, and the steam or hot water can be supplied.