Method for splicing bands end-to-end by double bonding making it possible to splice a splicing end of an upstream band waiting to be unwound with a splicing end of an unwinding downstream band which is ending, each end of the two bands (1, 2) ending with a butt-jointing edge (5, 6) and said bands (1, 2) each having two outer and inner opposing faces (1a, 1b; 2a, 2b), a method characterized in that it consists in performing, in a first stage, the following preparation steps, from, on the one hand, a first single-sided adhesive strip and a second single-sided adhesive strip, and, on the other hand, a cutting head (11, 12), three mutually parallel or substantially parallel reference planes, namely a first supporting plane, a second supporting plane and a splicing plane situated between the two: - bonding the first strip by its adhesive face onto the outer face of the splicing end of the upstream band leaving a part, preferably half, of its adhesive face, called visible adhesive face part, extending beyond its butt-jointing edge, - positioning and supporting the splicing end provided with the first strip in the supporting plane, such that the visible adhesive face part is facing the outer face of the downstream band, - positioning and supporting the second strip in the second supporting plane such that its adhesive face is facing the inner face of the downstream band and in the axis of the adhesive face of the first strip, then, in performing, in a second stage, the following splicing steps: - stopping the unwinding of the downstream band, - cutting the downstream band in the splicing plane of a transverse cutting line situated in the axis or substantially in the axis of the buttjointing edge of the upstream band and extending parallel or substantially parallel to said butt-jointing edge, so as to form the splicing end of the downstream band, - displacing the splicing end provided with the first strip and the second strip to the splicing plane so as to place the splicing ends of the respective downstream and upstream bands end-to-end by the joining of their respective butt-jointing edges (5, 6) and to apply, with pressure on either side of said join, the adhesive face of the first strip onto the outer faces (1a, 2a) of the splicing ends of the upstream and downstream bands (1, 2) and the adhesive face of the second strip onto the inner faces (1b, 2b) of the splicing ends of the downstream and upstream bands (1, 2). - bonding the first strip by its adhesive face onto the outer face of the splicing end of the upstream band leaving a part, preferably half, of its adhesive face, called visible adhesive face part, extending beyond its butt-jointing edge, - positioning and supporting the splicing end provided with the first strip in the supporting plane, such that the visible adhesive face part is facing the outer face of the downstream band, - positioning and supporting the second strip in the second supporting plane such that its adhesive face is facing the inner face of the downstream band and in the axis of the adhesive face of the first strip, - stopping the unwinding of the downstream band, - cutting the downstream band in the splicing plane of a transverse cutting line situated in the axis or substantially in the axis of the buttjointing edge of the upstream band and extending parallel or substantially parallel to said butt-jointing edge, so as to form the splicing end of the downstream band, - displacing the splicing end provided with the first strip and the second strip to the splicing plane so as to place the splicing ends of the respective downstream and upstream bands end-to-end by the joining of their respective butt-jointing edges (5, 6) and to apply, with pressure on either side of said join, the adhesive face of the first strip onto the outer faces (1a, 2a) of the splicing ends of the upstream and downstream bands (1, 2) and the adhesive face of the second strip onto the inner faces (1b, 2b) of the splicing ends of the downstream and upstream bands (1, 2).