The invention discloses a double-clutch transmission. The double-clutch transmission is characterized by comprising seven forward gears, a reverse gear, four synchronizers and a group of dual gear meshed structures. The double-clutch transmission has the advantages that idler shafts and auxiliary gears in the traditional transmission are omitted owing to the design of a specific connected tooth reverse gear structure, the internal structure of the transmission can be simplified, the manufacturing cost can be reduced, and space of the transmission can be saved; the difficulty in matching reverse speed radio and tooth quantities can be reduced owing to reverse connected tooth gears, and the requirement on the capacity of the synchronizers can be lowered; an engine is good in economical efficiency and dynamic property owing to the structure of the transmission with the seven advance gears; seven advance gears and a reverse gear are arranged reasonably; each synchronizer can be utilized sufficiently; dual gears are used for a fourth gear and a sixth gear, so that the integral axial distance of the transmission can be shortened, and the balance of matching selection of the axial distance and the tooth quantities can be improved.