For the traditional hydraulic wind turbine using a single large-displacement quantitative hydraulic pump and a single variable motor combination, there is often a phenomenon that the system is in underpower operation at low and medium wind speeds. A multi-pump multi-motor combination transmission scheme was studied, according to the different wind speeds, the hydraulic pump and motor in and out was controlled correspondingly, so as to maximize the conversion of wind energy into electrical energy. The speed control of the series and parallel motors was studied, and the composite speed closed-loop control and decoupling compensation control were used to stabilize the speed at the synchronous speed. The co-simulation results of AMESim/Simulink prove that the system can adapt to the operation of complex wind speed conditions and meet the grid connection requirements, which is more stable and reliable than the traditional single-pump single-motor system.