Two-gear automatic transmission of electric vehicle

The utility model provides a two-gear automatic transmission of an electric vehicle, which comprises an input shaft (20), an output shaft (30), an automatic clutch (40), a one-way clutch (50), a reverse gear (62), a parking gear (64) and a toothed sleeve (66), wherein the automatic clutch is arranged on the input shaft and used for connecting the input shaft with a high-speed driving gear; the one-way clutch is an overrunning clutch which is arranged on the output shaft and used for connecting a low-speed driven gear with the output shaft; the reverse gear and the parking gear are arranged on the output shaft, the reverse gear is in rigid connection with the output shaft, and the parking gear is sleeved on the output shaft in a sliding way and is in rigid connection with a transmission casing; and the toothed sleeve is optionally engaged with the reverse gear and the parking gear at the same time, or engaged with the low-speed driven gear and the reverse gear at the same time, or only engaged with the low-speed driven gear. The two-gear automatic transmission provided by the utility model has the advantages of simple structure, small volume and smooth gear shift, is convenient to carry on an entire vehicle and is easy to match with the working efficiency of a motor.