An oil/slurry burner with injection atomization for the gasification of solids-containing liquid fuels under high pressures of e.g. 80 bar (8 MPa) and high temperatures of e.g. 1200 to 1900 degrees centigrade in reactors with liquid slag removal is proposed, wherein a plurality of feeding elements disposed outside the annular duct concentrically with respect to the burner axis are provided for introducing liquid fuel and atomizing agent, the individual feeding elements being implemented intrinsically straight in the burner, inclined to the burner axis in the direction of the burner mouth, and ending at the burner mouth adjacent to the oxidant outlet. By introducing the liquid fuel and atomizing agent in individual completely implemented tubes with a corresponding nozzle, different fuels can be supplied simultaneously via the individual feeds and converted in a flame reaction.