An adhesive dispenser (100) for applying adhesive on a substrate, comprising an inlet conduit (1a) configured for being coupled to at least one external cartridge in which an adhesive is stored, and distribution means (1) comprising a plurality of outlet openings configured for dispensing said adhesive. The distribution means (1) also comprise movable adjustment means (3) wherein at least part of said adjustment means (3) are arranged in each outlet opening such that said adjustment means (3) demarcate an adjustable blocked area in each outlet opening. An outlet conduit having a variable section is formed in the area not covered by said blocked area in each outlet opening, adhesive beads having a different cross-section being able to be obtained by moving the adjustment means (3).