The invention provides a positive pressure adaptive planetary bevel gear power split type continuously variable transmission, the structure includes a planetary bevel gear train, a differential gear train and a hydraulic system; the planetary bevel gear train structure includes: a planetary bevel gear, Speed regulating ring, planetary ring conical conical surface, driving center bevel gear and driven center bevel gear; differential gear train includes: output center wheel, planet carrier, synchronous planetary gear, planetary gear, synchronous internal meshing gear, synchronous cylindrical gear, Fixed shaft gear, central inner cylindrical gear, cylindrical gear; hydraulic control system includes power output shaft, torque sensor, hydraulic cylinder, displacement sensor (pressure sensor), control system, drive circuit, motor, hydraulic pump, servo amplifier and electro-hydraulic servo valve. The present invention selects complete power split transmission, and finally synthesizes the output at the planetary gear, which effectively improves the problem of being unable to provide constant positive pressure in the prior art.