The invention discloses a two-gear transmission suitable for an electric vehicle. The two-gear transmission comprises a shell, an overrun clutch arranged in the shell, a brake, a first-stage planetary reducer, a main reducing gear and a differential mechanism connected with the main reducing gear; the first-stage planetary reducer comprises an inner gear ring, a sun gear arranged in the center of the inner gear ring, a planet gear arranged between the sun gear and the inner gear ring and a planet carrier; the main reducing gear comprises a driving wheel and a driven wheel, and the driven wheel is connected with the planet carrier of the first-stage planetary reducer; the overrun clutch comprises an inner star wheel and an outer ring, the inner star wheel of the overrun clutch is connected between a motor output shaft and the sun gear of the first-stage planetary reducer; and the brake is connected with the inner gear ring of the first-stage planetary reducer. The two-gear transmission is reasonable in structural arrangement, two-stage speed adjustment can be achieved, the structure is more compact, the using stability and reliability can be effectively guaranteed, the applicability is high, and the practicability is good.