The invention discloses an eight-speed dual-clutch automatic transmission, which includes a double clutch, first and second input shafts, first and second output shafts and a differential, and the first and second input shafts are arranged coaxially; One input shaft is fixed with a reverse gear, fifth gear and third gear driving gear; the second input shaft is fixed with sixth gear, fourth gear and second gear driving gear; the first output shaft is fitted with first gear, fifth gear and sixth gear 1. Second gear driven gear, the second output shaft is equipped with reverse gear, seventh gear, third gear and fourth gear driven gear; the first output shaft is equipped with first gear, fifth gear, second gear and sixth gear synchronizer, the second gear The second output shaft is equipped with synchronizers for reverse gear, seventh gear, third gear, and fourth gear, and the eighth gear synchronizer is fixed on the fifth gear driven gear; the first and second output shafts are driven by the first and second main reduction gears. The gears and the final reduction gear are connected to the differential. The invention effectively shortens the axial length and radial length of the transmission, and simplifies the structure.