Two-gear transmission of pure electric automobile

The invention relates to the technical field of pure electric automobiles, in particular to a two-gear transmission of a pure electric automobile. The invention aims to solve the technical problems that an existing pure electric automobile is complex in speed change structure and unreliable in performance. According to the following technical schemes, an input shaft is coaxial with an output shaft, the input shaft is provided with at least three planetary shafts through a planetary carrier, first-gear driving planetary gears, second-gear driving planetary gears and reverse-gear driving planetary gears are rotationally mounted on the planetary shafts, a first-gear driven sun gear, a second-gear driven sun gear, a reverse-gear driven sun gear are rotationally mounted on an output shaft, andthe first-gear driven sun gear, the second-gear driven sun gear and the reverse-gear driven sun gear are coaxially and fixed with a first gear ring, a second gear ring and a third gear ring correspondingly; and the two-gear t