The invention belongs to automobile transmission, in particular to an automobile transmission of which countershafts of a main box and a minor box are in asymmetric arrangement. The automobile transmission consists of the main box and the minor box, and is characterized in that a main-box countershaft is arranged in the main box; two minor-box countershafts are arranged in the minor box; and the main-box countershaft and the minor-box countershafts are in asymmetric arrangement. A gear is arranged on a shaft I on the main box; a plurality of gears, synchronizers and toothed sleeves are arranged on a shaft II of the main box; the synchronizers and the toothed sleeves arranged on the shaft II rotate together with the shaft II; a plurality of gears are arranged on the main-box countershaft; the gears on the shaft II and the gears on the countershaft are relatively engaged and rotated with each other; an input gear, a synchronizer, a main reduction gear, two minor-box countershafts and a minor-box main shaft are arranged in the minor box; and the gear in the minor box engages mutually with the gears on the two countershafts by use of the main reduction gear respectively. The automobile transmission has the characteristics of small gear shifting force, long life span and the like, reduces the driving strength of drivers, increases driving comfort, and guarantees driving safety at the same time.