The invention discloses a transmission lubricating method suitable for a hybrid electric vehicle. The transmission lubricating method suitable for the hybrid electric vehicle is characterized in that the vehicle includes a transmission, lubricating oil, an electric pump and a mechanical pump; the lubricating oil is accommodated in the transmission; and the electric pump and the mechanical pump are respectively communicated with the bottom and the top of the transmission for sucking out the lubricating oil from the bottom of the transmission and pressurizing to spray from the top of the transmission to lubricate the transmission. The method comprises the following steps: a present working mode of the vehicle is judged; the working mode includes a pure electric mode by a driving motor, and a hybrid electric mode of synchronous driving by the driving motor and an engine; and the electric pump and the mechanical pump are selectively started or closed to lubricate the transmission. The better transmission lubricating method can prevent reduction of the service life of the electric pump and the reliability caused by the electric pump above a rated working point for a long time.