The invention discloses a directly-driven straddling-type gearless single-rail bogie. The single-rail bogie comprises a frame, a traction device, a basic braking device, a shock reduction device, stabilizing wheels, guiding wheels and walking wheels, wherein the traction device, the basic braking device, the shock reduction device, the stabilizing wheels, the guiding wheels and the walking wheels are installed on the frame. An axle of the walking wheel pair is directly linked with a permanent magnet motor suspended on the frame through a split coupling, a split axle box composed of an upper axle box body and a lower axle box body is installed on the frame, the upper axle box body and the lower axle box body are detachably and fixedly connected, and the upper axle box body is fixed to a side beam of the frame and used for installing the basic braking device. The direct traction transmission technology of the permanent magnet motor is utilized, in this way, the structure is greatly simplified, the weight is reduced, transmission efficiency is improved, and environmental-protection capacity and vehicle dynamics properties are improved.