Milling tool (100; 200) for machining fibre composites, having a clamping section and a cutting section which extend along a longitudinal axis, wherein the cutting section is designed in a cylindrical basic shape, the outer circumference of which is divided by a plurality of intersecting first main chip grooves, which are designed as left-hand spirals, and second main chip grooves, which are designed as right-hand spirals, into a multiplicity of cutting units which each have a first circumferential cutter running along a left-hand spiral and a second circumferential cutter running along a right-hand spiral, wherein the first circumferential cutters and the second circumferential cutters are each formed along a common enveloping cylindrical casing surface which determines the outer circumference of the cutting section, the first circumferential cutters are each adjoined in the circumferential direction by first flank surfaces running at a first clearance angle (γ) and the second circumferential cutters are each adjoined in the circumferential direction by second flank surfaces running at a second clearance angle, wherein a plurality of auxiliary chip grooves are formed on the cutting section, said auxiliary chip grooves extending spirally and being recessed in the radial direction in relation to the first and second flank surfaces (5; 6) and dividing the individual cutting units into a first region on which the respective first circumferential cutter with the first flank surface is formed, and into a second region on which the respective second circumferential cutter with the second flank surface is formed, characterized in that the auxiliary chip grooves extend along left-hand spirals which run parallel to the first main chip grooves, or the auxiliary chip grooves extend along right-hand spirals which run parallel to the second main chip grooves. wherein the cutting section is designed in a cylindrical basic shape, the outer circumference of which is divided by a plurality of intersecting first main chip grooves, which are designed as left-hand spirals, and second main chip grooves, which are designed as right-hand spirals, into a multiplicity of cutting units which each have a first circumferential cutter running along a left-hand spiral and a second circumferential cutter running along a right-hand spiral, wherein the first circumferential cutters and the second circumferential cutters are each formed along a common enveloping cylindrical casing surface which determines the outer circumference of the cutting section, the first circumferential cutters are each adjoined in the circumferential direction by first flank surfaces running at a first clearance angle (γ) and the second circumferential cutters are each adjoined in the circumferential direction by second flank surfaces running at a second clearance angle, wherein a plurality of auxiliary chip grooves are formed on the cutting section, said auxiliary chip grooves extending spirally and being recessed in the radial direction in relation to the first and second flank surfaces (5; 6) and dividing the individual cutting units into a first region on which the respective first circumferential cutter with the first flank surface is formed, and into a second region on which the respective second circumferential cutter with the second flank surface is formed, characterized in that the auxiliary chip grooves extend along left-hand spirals which run parallel to the first main chip grooves, or the auxiliary chip grooves extend along right-hand spirals which run parallel to the second main chip grooves.