The invention relates to a power split CVT transmission and a torque transmission method therefor. The method comprises the following steps: two routes of torque are output by the dynamic torque through a planet gear mechanism, one route of which is transmitted to a drive conical disk component to drive a driven conical disk component and a steel belt arranged therebetween to be transmitted to an output shaft; meanwhile the other route is transmitted to a power output shaft by matching the planet gear mechanism and an intermediate transition gear mechanism; in the power split CVT transmission, one output end of the planet gear mechanism connected to the power is connected to an input belt axle mechanism, a transmission steel belt is arranged between the input belt axle mechanism and an output belt axle mechanism, the output belt axle mechanism and the torque output shaft is axially fixed to transmit the torque, the other output is connected to a decelerating mechanism of the intermediate transition gear to transmit the torque to the torque output shaft. In the invention, most of torque is transmitted and output through the intermediate gear, and the transmission efficiency of CVT is greatly improved and the integrated economical efficiency is also improved due to high transmission efficiency of the gears.