The invention discloses an electric single-opening external swing door. The electric single-opening external swing door comprises a door frame, a door leaf and a driving mechanism are arranged on thedoor frame, and the driving mechanism and the door leaf are hinged through a rotating arm assembly; the driving mechanism comprises a driving assembly, the driving assembly is connected with a reduction gearbox assembly, the reduction gearbox assembly is connected with the door frame through a mounting back plate, and an output shaft of the reduction gearbox assembly is connected with the rotatingarm assembly; and the driving assembly comprises a motor bracket and a lower mounting plate, a driving motor assembly and a lock stopper mounting plate assembly are arranged on the motor bracket, anunlocking bracket and a fixed unlocking block are arranged on the lower mounting plate, the unlocking bracket is connected with a reset part, the lower mounting plate is connected with the motor bracket, and the motor bracket can rotate relative to the lower mounting plate. The electric single-opening external swing door is mainly used in a passenger car door system, has the multiple advantages that obstacle detection sensitivity is high, the ability to open and close the door on an abrupt slope is high, the structure is compact, assembly is convenient, and the self-locking function is realized, and safety is high.