Method for inerting toxic products by plasma melting, characterised in that it comprises the following steps: a) a vitrifiable ground load to be treated in a melt bath is introduced continuously, said ground load falling via gravity into said bath, said bath being placed in a melting chamber having an internal volume bounded by walls covered at least partially by refractory elements, b) at least one plasma jet (15, 16) is directly sent into said melt bath, said plasma jet being in addition directed along a propagation axis (17, 18) lying out of the vertical plane containing the normal to the wall at the point of intersection between said propagation axis (17, 18) and said wall and said plasma jet being sent in an inclined manner to said melt bath and sloping in order to stir said melt bath, each plasma jet (15, 16) being generated by a non-transferred arc plasma source (8, 9) mounted on said melting chamber, c) at least one part of the melt bath is sent to a refining bath, said refining bath being placed in a refining and casting chamber in communication in its upstream part with said melting chamber, said refining and casting chamber having an internal volume bounded by walls covered at least partially by refractory elements, d) a plasma jet is sent directly into the refining bath to the upstream part of said refining and casting chamber in communication with said melting chamber in order to repel towards the melt bath any unmelted elements, said plasma jet being generated by a non-transferred arc plasma source mounted in the downstream part of said refining and casting chamber, and e) tangentially to the walls of the melting chamber, over at least one part of these walls, a gaseous oxidising fluid at ambient temperature is injected. a) a vitrifiable ground load to be treated in a melt bath is introduced continuously, said ground load falling via gravity into said bath, said bath being placed in a melting chamber having an internal volume bounded by walls covered at least partially by refractory elements, b) at least one plasma jet (15, 16) is directly sent into said melt bath, said plasma jet being in addition directed along a propagation axis (17, 18) lying out of the vertical plane containing the normal to the wall at the point of intersection between said propagation axis (17, 18) and said wall and said plasma jet being sent in an inclined manner to said melt bath and sloping in order to stir said melt bath, each plasma jet (15, 16) being generated by a non-transferred arc plasma source (8, 9) mounted on said melting chamber, c) at least one part of the melt bath is sent to a refining bath, said refining bath being placed in a refining and casting chamber in communication in its upstream part with said melting chamber, said refining and casting chamber having an internal volume bounded by walls covered at least partially by refractory elements, d) a plasma jet is sent directly into the refining bath to the upstream part of said refining and casting chamber in communication with said melting chamber in order to repel towards the melt bath any unmelted elements, said plasma jet being generated by a non-transferred arc plasma source mounted in the downstream part of said refining and casting chamber, and e) tangentially to the walls of the melting chamber, over at least one part of these walls, a gaseous oxidising fluid at ambient temperature is injected.