The invention relates to a rotating speed recovery method of a double-fed induction generator after virtual inertia control, and belongs to the technical field of control in new energy generation. The method includes: building a wind turbine transmission chain motion model, and converting the motion model into the power form; converting the motion model in the power form into the standard form capable of designing an extended state observer; designing the extended state observer, and estimating the mechanical power outputted by a wind turbine; setting parameters of the extended state observer; and designing the acceleration power of the wind turbine based on the mechanical power obtained by estimation and calculating an electromagnetic power reference value of the wind turbine. Compared with the conventional proportion/proportion-integral rotating speed recovery strategy of virtual inertia of the double-fed induction generator, according to the control method, the problem of difficult adjustment of proportion/proportion-integral parameters is avoided, the rotating speed can be rapidly recovered, and secondary falling of system frequency is prevented.