The invention discloses an excitation circuit of a double-feed asynchronous wind turbine, which includes an energy converter and a controller. The energy converter includes a commutating unit, an energy dissipating unit, an inverting unit, and a drive circuit. The commutating unit is connected with the inverting unit; the input end of the commutating unit acting as the input end of the energy converter 14 is connected with the secondary edge of a transformer; the output end of the inverting unit is connected with the output end of the energy dissipating unit, and is connected with the input end of a rotor contact as the output end of the energy converter. The output end of a digital signal processor of the controller is connected to the input end of the inverting unit after being seriallyconnected into the drive circuit. The invention has the advantages that the cost of the hardware is lowered greatly, the complexity of the control arithmetic of the low-excitation circuit is lowered obviously; the separate adjustments of the active power and the reactive power in the wide rotation speed range are realized, and the factors of the outputted power of the generator can be adjusted and controlled.