The invention provides a transmission device used for a longitudinally-arranged rear-drive hybrid electric vehicle. The transmission device comprises a first electric motor (EM1), a second electric motor (EM2), an input shaft, a first brake (B1), a second brake (B2), a first clutch (C1), a second clutch (C2) and a planetary gear coupling mechanism; the planetary gear coupling mechanism comprises asingle planetary gear row (PG1) and a double planetary gear row (PG2); and an engine is connected with the planetary gear coupling mechanism through the first clutch (C1), the second clutch (C2), thefirst brake (B1), the second brake (B2), the first electric motor (EM1) and the second electric motor (EM2) so as to achieve various pure electric and hybrid electric driving modes. According to thetransmission device used for the longitudinally-arranged rear-drive hybrid electric vehicle, the structure is compact, matching work with the engines with different displacement can be realized, and the torque demand and manufacturing cost of the electric motors are reduced.