The invention provides a dual-motor dual-clutch dual-speed-ratio electric vehicle power assembly and an electric vehicle, and relates to the field of electric vehicles, the dual-motor dual-clutch dual-speed-ratio electric vehicle power assembly comprises an outer shell, a composite motor and a dual-clutch transmission, the composite motor comprises a first motor and a second motor, the first motor comprises a first rotor, a first stator and a first motor shaft, the first rotor is rotatably arranged in the outer shell, and one end of the first rotor is connected with the first motor shaft. The first motor shaft is hollow, and the end, away from the first rotor, of the first motor shaft extends out of the outer shell and is in running fit with the outer shell. The second motor comprises a second rotor, a second stator and a second motor shaft; the second rotor is rotatably arranged in the second stator, and the second motor shaft is sleeved in the second rotor. The first stator is arranged in the first rotor, and the second stator is arranged in the first stator; or, the first stator is arranged outside the first rotor, and the second stator is arranged in the first rotor.