A method for combined rolling and extruding of aluminium or aluminium alloys, including the following stages: a cast billet is crystallised, the cast billet with an optimum temperature ensuring accurate billet positioning is fed into a working gauge formed by a grooved roll and a finned roll, in which the billet rolling is carried out, and then to the die, through which the billet extrusion is carried out, ready-made extruded products are obtained, while before feeding the cast billet into the working gauge, the temperature of the cast billet is adjusted to the optimum temperature by additional heating or cooling, feeding of the cast billets into the working gauge is carried out at an angle to the extrusion axis or parallel to this axis, when the cast billet is fed into the working gauge, a cladding layer of aluminium or aluminium alloy is created on the surfaces of the rolls (7, 8) by extruding the cast billet through gaps formed between the surfaces of the rolls and the die, such gaps are made for the purpose of forming a cladding layer during combined rolling and extrusion; wherein the finned roll comprises a T-shaped fin and wherein the die comprises a working part which has a T-shaped section and which is in contact with a deformation zone of the cast billet in the working gauge; wherein, the thickness of the aluminium or aluminium alloy cladding layer on the surfaces of the rolls (7, 8) is equal to 0.2 to 2.0 mm; wherein the gaps include: gap between the surfaces of the rolls (7, 8) which are in contact with each other; gap between the surface of the rolls (7, 8) and the surface of the die, which are simultaneously in contact with the cast billet; gap between the surfaces of the rolls (7, 8), where aluminum or an aluminum alloy is locked; gap between the side surfaces of the roll and the contact surfaces of the die; and gap that prevents contact of the surface of the rolls (7, 8) with the cladding layer and the non-contact surface of the die; wherein the gaps have the following widths: gap - 0.2-0.5 mm; gap - 2.0-3.0 mm; gap - 0.2-0.5 mm; gap - 1.0-2.0mm; and gap - 2.0-3.0 mm wherein the optimum temperature of the cast billet, before its feeding onto the surface of the rolls, is maintained in a range of 380 to 420 °C. a cast billet is crystallised, the cast billet with an optimum temperature ensuring accurate billet positioning is fed into a working gauge formed by a grooved roll and a finned roll, in which the billet rolling is carried out, and then to the die, through which the billet extrusion is carried out, ready-made extruded products are obtained, while before feeding the cast billet into the working gauge, the temperature of the cast billet is adjusted to the optimum temperature by additional heating or cooling, feeding of the cast billets into the working gauge is carried out at an angle to the extrusion axis or parallel to this axis, when the cast billet is fed into the working gauge, a cladding layer of aluminium or aluminium alloy is created on the surfaces of the rolls (7, 8) by extruding the cast billet through gaps formed between the surfaces of the rolls and the die, such gaps are made for the purpose of forming a cladding layer during combined rolling and extrusion; wherein the finned roll comprises a T-shaped fin and wherein the die comprises a working part which has a T-shaped section and which is in contact with a deformation zone of the cast billet in the working gauge; wherein, the thickness of the aluminium or aluminium alloy cladding layer on the surfaces of the rolls (7, 8) is equal to 0.2 to 2.0 mm; wherein the gaps include: gap between the surfaces of the rolls (7, 8) which are in contact with each other; gap between the surface of the rolls (7, 8) and the surface of the die, which are simultaneously in contact with the cast billet; gap between the surfaces of the rolls (7, 8), where aluminum or an aluminum alloy is locked; gap between the side surfaces of the roll and the contact surfaces of the die; and gap that prevents contact of the surface of the rolls (7, 8) with the cladding layer and the non-contact surface of the die; wherein the gaps have the following widths: gap - 0.2-0.5 mm; gap - 2.0-3.0 mm; gap - 0.2-0.5 mm; gap - 1.0-2.0mm; and gap - 2.0-3.0 mm wherein the optimum temperature of the cast billet, before its feeding onto the surface of the rolls, is maintained in a range of 380 to 420 °C. gap between the surfaces of the rolls (7, 8) which are in contact with each other; gap between the surface of the rolls (7, 8) and the surface of the die, which are simultaneously in contact with the cast billet; gap between the surfaces of the rolls (7, 8), where aluminum or an aluminum alloy is locked; gap between the side surfaces of the roll and the contact surfaces of the die; and gap that prevents contact of the surface of the rolls (7, 8) with the cladding layer and the non-contact surface of the die; wherein the gaps have the following widths: gap - 0.2-0.5 mm; gap - 2.0-3.0 mm; gap - 0.2-0.5 mm; gap - 1.0-2.0mm; and gap - 2.0-3.0 mm wherein the optimum temperature of the cast billet, before its feeding onto the surface of the rolls, is maintained in a range of 380 to 420 °C. gap - 0.2-0.5 mm; gap - 2.0-3.0 mm; gap - 0.2-0.5 mm; gap - 1.0-2.0mm; and gap - 2.0-3.0 mm wherein the optimum temperature of the cast billet, before its feeding onto the surface of the rolls, is maintained in a range of 380 to 420 °C.