Disclosed herein is a multi-stage DCT for a vehicle including: a first input shaft configured to be powered by a first clutch; a second input shaft installed to form a concentric axis with the first input shaft and to be supplied with power through the second clutch; a plurality of odd-numbered drive gears configured to be installed on the first input shaft to implement odd-numbered gear levels; a plurality of even-numbered drive gears configured to be installed on the second input shaft to implement even-numbered transmission planes; a first countershaft configured to be installed in parallel with the first input shaft and the second input shaft; a plurality of odd-numbered driven gears and a plurality of even-numbered driven gears configured to be installed on the first countershaft to be engaged with the odd-numbered drive gears and the even-numbered drive gears; and a plurality of synchronizers configured to selectively connect the odd-numbered gear driven gear and the even-numbered gear driven gear to the first countershaft..