Dual-motor speed reducer driving system and vehicle

The invention discloses a dual-motor speed reducer driving system and a vehicle. The dual-motor speed reducer driving system comprises a first motor, a second motor, a third motor and a fourth motor, a second output shaft of the second motor is provided with a second primary driving gear capable of rotating along with the second output shaft; a first-stage driven gear and a second-stage driving gear are fixed to the transmission shaft, and the first-stage driven gear is in meshing transmission with the first first-stage driving gear and the second first-stage driving gear; and the differential assembly is fixedly provided with a second-stage driven gear, and the second-stage driving gear is in meshing transmission with the second-stage driven gear. Different torque requirements can be met by adopting the two motors, the two motors share one first-stage driven gear and two-stage speed reduction, so that the structure is simple, and compared with the mode that the two motors independently correspond to one spee