The invention provides a wireless electric energy transmission system, which comprises a transmitting end and a receiving end, wherein the transmitting end comprises a DC/AC inverter circuit, a firstinductor and a first capacitor, the DC/AC inverter circuit, the first inductor and the first capacitor are connected in series, the receiving end comprises an AC/DC rectifying circuit, a second inductor and a second capacitor, the AC/DC rectifying circuit, the second inductor and the second capacitor are connected in series, the electric energy of the transmitting end is transmitted to the receiving end through electromagnetic induction between the first inductor and the second inductor, and the transmitting end is configured for: detecting the value of the resonant frequency of the transmitting end; detecting the value of the coupling coefficient between the transmitting end and the receiving end; calculating the value of the constant-voltage working frequency of the transmitting end according to the resonant frequency and the coupling coefficient; and controlling the working frequency of the DC/AC inverter circuit according to the calculated constant-voltage working frequency. The method can be specifically applied to a wireless charging or wireless power supply scene.