The invention provides a composite axial-flow hydrotransmitter. The invention adopts the technical scheme that an output
planet carrier (21) is connected with an input gearwheel (25), an input great gear rim (22) and an input
pinion (23), a connection
planet carrier (24) is connected with the input gearwheel (25), an output gear (26), an output
pinion (27) and an output gearwheel (28), the output gear (26) is connected with the output
pinion (27) and an output shaft (3), a connection carrier (20) is connected with the output gearwheel (28), a plurality of other elements and the input end (41) of a gear shifting mechanism (4), the output end (42) of the gear shifting mechanism (4) is respectively connected with the input great gear rim (22), an input gear (51) of an input gear pair (5) and the output end (72) of a fixed one-way
clutch (7), an output gear (52) of the input gear pair (5) is connected with the input end (61) of the axial-flow hydrotransmitter (6), the output end (62) of the axial-flow hydrotransmitter (6) is connected with an input gear (81) of an output gear pair (8), an output gear (82) of the output gear pair (8) is connected with the input end (91) of the one-way
clutch (9), and the output end (92) of the one-way
clutch (9) is respectively connected with the input pinion (23) and an input shaft (1).