Active high-lift system for short take-off and landing aircraft, comprising: - a biplane wing which comprises a main lift surface and a secondary lift surface , each one of the lift surfaces comprising a leading edge (1.1, 2.1), a trailing edge (1.2, 2,2), an extrados (1.3, 2.3) and an intrados (1.4, 2.4) and where: • the extrados (1.3) of the main lift surface is arranged facing the intrados (2.4) of the secondary lift surface , • the main lift surface comprises a high-lift device (1.2.2) located on the trailing edge (1.2) and comprising a surface which is curved towards the intrados (1.4) of said main lift surface along the direction of the chord of the main lift surface , • the secondary lift surface comprises a hinged flow control element (2.2.1) located on the trailing edge (2.2) and adapted to rotate around a hinging axis situated along the direction of the wingspan of the secondary lift surface , - a set of one or more motorized propulsion elements , where each motorized propulsion element comprises a motor and a propeller and is situated above the extrados (1.3) of the main lift surface , upstream of the leading edge of the secondary lift surface so that the secondary lift surface is configured to be immersed within the wake of the propellers , characterized in that each motorized propulsion element is situated downstream of the leading edge (1.1) of the main lift surface . - a biplane wing which comprises a main lift surface and a secondary lift surface , each one of the lift surfaces comprising a leading edge (1.1, 2.1), a trailing edge (1.2, 2,2), an extrados (1.3, 2.3) and an intrados (1.4, 2.4) and where: • the extrados (1.3) of the main lift surface is arranged facing the intrados (2.4) of the secondary lift surface , • the main lift surface comprises a high-lift device (1.2.2) located on the trailing edge (1.2) and comprising a surface which is curved towards the intrados (1.4) of said main lift surface along the direction of the chord of the main lift surface , • the secondary lift surface comprises a hinged flow control element (2.2.1) located on the trailing edge (2.2) and adapted to rotate around a hinging axis situated along the direction of the wingspan of the secondary lift surface , • the extrados (1.3) of the main lift surface is arranged facing the intrados (2.4) of the secondary lift surface , • the main lift surface comprises a high-lift device (1.2.2) located on the trailing edge (1.2) and comprising a surface which is curved towards the intrados (1.4) of said main lift surface along the direction of the chord of the main lift surface , • the secondary lift surface comprises a hinged flow control element (2.2.1) located on the trailing edge (2.2) and adapted to rotate around a hinging axis situated along the direction of the wingspan of the secondary lift surface , - a set of one or more motorized propulsion elements , where each motorized propulsion element comprises a motor and a propeller and is situated above the extrados (1.3) of the main lift surface , upstream of the leading edge of the secondary lift surface so that the secondary lift surface is configured to be immersed within the wake of the propellers , <EOS>