The invention relates to a method for producing a tube for a heat exchanger, in particular for a motor vehicle, in which a long tube (1), which is provided with turbulence inserts (2) on the surface thereof, is separated into at least two individual tubes. In order to further reduce the production costs and nevertheless achieve a clean cutting surface, a first part (11) of an at least two-part cutting device (11, 12) is introduced into the interior of the long tube (8) through at least one opening (3, 4) of the long tube (8) and the second part (12) of the cutting device (11, 12) is placed against the outer face of the long tube (8) approximately opposite of the inner, first part (11) of the cutting device (11, 12), wherein the first part (11) and the second part (12) of the cutting device (11, 12) are pressed against one another in order to dividing the long tube (8).