The present invention relates to an identification method of the coil self-induction in a resonant wireless charging system. The identification method is used to obtain the coil self-induction of the emission ends and the reception ends of the resonators in the resonant wireless charging system separately, and comprises the following steps of 1) establishing an equivalent circuit model of the resonators in the wireless charging system and simplifying; 2) according to the simplified equivalent circuit model, establishing a transient state space equation, and carrying out the Laplace transformation and the bilinear discretization on a system state equation to obtain a least-square matrix form; 3) adopting a least square method to estimate the matrix form, and obtaining a least square estimated value of a parameter vector in a process matrix form; 4) substituting the least square estimated value of the parameter vector into the matrix form to solve, and finally obtaining the coil self-induction of the emission ends and the reception ends. Compared with the prior art, the identification method of the present invention has the advantages of being simple to calculate, being high in identification precision, being able to realize the online identification, solve the system mismatching and improve the efficiency, etc.