The invention provides a motor train unit locomotive and a motor train unit. The motor train unit comprises a locomotive front end and a locomotive rear end, at least two different windward surfaces are arranged at the locomotive front end, the motor train unit locomotive comprises a rotating device, and the rotating device is arranged between the locomotive front end and the locomotive rear end and used for achieving rotation of the locomotive front end relative to the locomotive rear end along the horizontal axis so as to achieve position changing of the different windward surfaces. The locomotive front end can rotate relative to the locomotive rear end so as to achieve mutual conversion of a single-arched locomotive and a double-arched locomotive. The motor train unit locomotive and the motor train unit overcome the defect that the motor train unit cannot adopt optimum anti-drag arrangement of the single-arched locomotive and a double-arched tail train in the prior art, reduce overall running resistance of the motor train unit, and are simple in structure and high in safety.