A transverse-drive bogie with a built-in axle box comprises frames (1) arranged at the front and rear ends of axles (2) respectively, two ends of each axle are fitted with wheels (3) respectively, theframes are mounted on the axles through primary suspension devices (5) and axle boxes (4), each frame comprises two side beams (11), two cross beams (12) are arranged in the middle of the side beamsin parallel, both the frames and the axle boxes are arranged on the inner sides of the wheels (3), four basic brake devices (35) are symmetrically arranged at the bottom of the two side beams of eachframe, two driving motors (33) and two gearboxes (32) are fixedly connected to the two cross beams of each frame, output shafts of the two driving motors are parallel to the corresponding axle, and output shafts of the two driving motors are connected with the axles through the gear boxes respectively. The mature reliable scheme of transversely arranged motors is used herein, so that mounting space is reduced at the premise of meeting the transmission torque requirement; the gearboxes employ two-stage transmission, so that the size of the gearboxes is reduced and the lower limit is guaranteed.