Hybrid powertrain, of combined series-parallel type for propelling a vehicle and comprising: - a combustion engine suitable for propelling the vehicle, said combustion engine comprising a drive shaft; - a first electrical machine suitable for generating electrical energy, said first electrical machine comprising a first stator and a first rotor, said first stator being fixed relative to the combustion engine; - a second electrical machine suitable for propelling the vehicle and for generating electrical energy, said second electrical machine comprising a second stator and a second rotor, said second stator being fixed relative to the combustion engine; - a first clutch comprising an input and an output; - a first transmission shaft suitable for driving at least one first wheel of the vehicle via a first differential; - a first reducing gear; in which: - the first electrical machine is suitable for supplying electrical energy to the second electrical machine to propel the vehicle; - said drive shaft is connected to said first rotor with a 1/1 transmission ratio; - said first rotor is permanently connected to said input of said first clutch with a 1/1 transmission ratio; - said output of said first clutch is connected to said first transmission shaft with a 1/1 transmission ratio; - the second rotor is connected to said first transmission shaft via said first reducing gear; - said first reducing gear is positioned in such a way that it is suitable for imposing a speed of rotation of the second rotor which is greater than the speed of rotation of said first transmission shaft; characterized in that the powertrain further comprises a second clutch, in that the first electrical machine is suitable for propelling the vehicle, and in that said drive shaft is connected to said first rotor via said second clutch. - a combustion engine suitable for propelling the vehicle, said combustion engine comprising a drive shaft; - a first electrical machine suitable for generating electrical energy, said first electrical machine comprising a first stator and a first rotor, said first stator being fixed relative to the combustion engine; - a second electrical machine suitable for propelling the vehicle and for generating electrical energy, said second electrical machine comprising a second stator and a second rotor, said second stator being fixed relative to the combustion engine; - a first clutch comprising an input and an output; - a first transmission shaft suitable for driving at least one first wheel of the vehicle via a first differential; - a first reducing gear; in which: - the first electrical machine is suitable for supplying electrical energy to the second electrical machine to propel the vehicle; - said drive shaft is connected to said first rotor with a 1/1 transmission ratio; - said first rotor is permanently connected to said input of said first clutch with a 1/1 transmission ratio; - said output of said first clutch is connected to said first transmission shaft with a 1/1 transmission ratio; - the second rotor is connected to said first transmission shaft via said first reducing gear; - said first reducing gear is positioned in such a way that it is suitable for imposing a speed of rotation of the second rotor which is greater than the speed of rotation of said first transmission shaft; characterized in that the powertrain further comprises a second clutch, in that the first electrical machine is suitable for propelling the vehicle, and in that said drive shaft is connected to said first rotor via said second clutch.