The utility model discloses a melting furnace for melting glass, which includes a crown and two pairs of side walls all provided with inner surfaces made of refractory materials, wherein at least one burner opening is arranged in the side walls, and the burner openings and the side walls are downwards arranged and form acute angles; and a burner perpendicular to the direction of the plane where the burner opening is arranged is arranged on the burner opening. Therefore, flame generated by the burner produces certain heat convection to glass metal to be melted, as the high-temperature region of flame is contacted with or near to the glass metal, the melting of glass metal can absorb radiation heating of flame and convection heating brought by flame, thereby greatly improving the heat efficiency and further improving the capability of saving energy; and besides, as the high-temperature region of flame is far from the crown, the difficult problems that the pure-oxygen flame seriously corrodes the crown, and the refractory materials are difficult to choose are solved.