PURPOSE: A combustible waste combustion device is provided to control mixing ratio of cracking gas and combustion air to be optimally. CONSTITUTION: A combustible waste combustion device comprises a melting member(100) and a pyrolyzing member(200). The melting means is comprised of an extrusion screw(102) and an extrusion cylinder(101). The extrusion screw pumps solid waste fuel. The extrusion cylinder surrounds the extrusion screw. The extrusion cylinder fuses the solid fuel by heating with an electric heater(104). The pyrolysis member is comprised of a pyrolysis cylinder(201), a pyrolysis nozzle(202) and a tar nozzle(205). The pyrolysis cylinder is connected to the extrusion cylinder and heated with a burner. The pyrolysis nozzle discharges pyrolysis gas. The tar nozzle discharges molten tar generated independently with a thermal decomposition process of the cracking gas.
