The invention relates to a double-clutch automatic gearbox comprising an input shaft (29), an input shaft gear (1), a first counter shaft (6), a second counter shaft (8), an intermediate (7), a power take-off device, at least an odd number gear pair, at least an even number gear pair, a first clutch (2) fixed on the first counter shaft (6), and a second clutch (3) fixed on the second counter shaft (8). The gearbox is characterized in that the power take-off device comprises a compensating gear (24), and a planetary mechanism fixedly connected with the compensating gear (24). The gearbox has the advantages of a small quantity of gears, small axial length and light weight, and is easier to be arranged and used in small fore-driving sedans.