Edge-banding roller (R) for spreading an adhesive substance, such as glue and the like, on at least one side surface or edge of a panel, such as a panel made of wood, fiberglass, plastic and the like, wherein said edge-banding roller (R) comprises a support cylinder , rotatable around its own axis of symmetry (B), and wherein said edge-banding roller (R) comprises a cladding arranged on the lateral surface of said support cylinder , which presents a plurality of application cavities for keeping said adhesive substance, wherein each application cavity has variable dimensions, said edge-banding roller (R) being characterized in that it further comprises a first conical element (C1) and a second conical element (C2) opposite to said first conical element (C1), wherein said first (C1) and second (C2) conical elements are made of a non-deformable material with respect to said support cylinder and said cladding , and they are arranged inside said support cylinder , such that the tops of each of said first (C1) and second (C2) conical elements are arranged facing each other, and in that said first (C1) and second (C2) conical elements are relatively movable, so as to move close and move away their tops within of said supporting cylinder , so as to elastically deform said support cylinder and said cladding , so that when said first (C1) and second (C2) conical elements are at a first distance between them, they exert a pressure on the walls of said support cylinder , causing a widening of said application cavities of said cladding , and when said first (C1) and second (C2) conical elements are at a second distance between them, wherein said second distance is greater than said first distance, said support cylinder and said cladding return to the initial dimensions, so that also each application cavity of said cladding returns to the initial dimension. wherein said edge-banding roller (R) comprises a support cylinder , rotatable around its own axis of symmetry (B), and wherein said edge-banding roller (R) comprises a cladding arranged on the lateral surface of said support cylinder , which presents a plurality of application cavities for keeping said adhesive substance, wherein each application cavity has variable dimensions, said edge-banding roller (R) being characterized in that it further comprises a first conical element (C1) and a second conical element (C2) opposite to said first conical element (C1), wherein said first (C1) and second (C2) conical elements are made of a non-deformable material with respect to said support cylinder and said cladding , and they are arranged inside said support cylinder , such that the tops of each of said first (C1) and second (C2) conical elements are arranged facing each other, and in that said first (C1) and second (C2) conical elements are relatively movable, so as to move close and move away their tops within of said supporting cylinder , so as to elastically deform said support cylinder and said cladding , so that when said first (C1) and second (C2) conical elements are at a first distance between them, they exert a pressure on the walls of said support cylinder , causing a widening of said application cavities of said cladding , and when said first (C1) and second (C2) conical elements are at a second distance between them, wherein said second distance is greater than said first distance, said support cylinder and said cladding return to the initial dimensions, so that also each application cavity of said cladding returns to the initial dimension. <EOS>