The invention discloses a large wind turbine generator system with double wind wheels, belongs to the field of generators, and aims at solving the problems of low unit capacity, high generator system investment, low generating capacity and the like of the existing wind turbine generator system with a single wind wheel. The large wind turbine generator system with the double wind wheels comprises a tower barrel, a cabin seat, the wind wheels, blades, transmission devices and a generator, wherein two groups of wind wheels, blades, transmission devices are provided respectively, and symmetrically arranged at the two sides of the generator respectively, and the first-group transmission device comprises a first main shaft, a first coupling, a first low gear shaft, a first gearbox, a first high-speed shaft and a first elastic coupling which are sequentially connected; and the second-group transmission device comprises a second main shaft, a second coupling, a second low gear shaft, a second gearbox, a second high-speed shaft and a second elastic coupling which are sequentially connected, and the first elastic coupling and the second elastic coupling are connected with double output shafts at the two ends of the generator respectively. The wind turbine generator system with the double wind wheels, which is disclosed by the invention, is safe and reliable in running, and easy to manufacture, install and maintain.