The invention discloses a single-relay wireless energy transmission system parameter design method. The single-relay wireless energy transmission system parameter design method is characterized by comprising the following steps: S1: a circuit topological structure of the single-relay wireless energy transmission system is determined; S2, self-inductance and coil internal resistance values of the three coils are determined; S3, the working frequency, the mutual inductance parameter and the load resistance value are determined; S4, the capacitance value of an emission coil compensation capacitoris determined; S5, a quality factor and a coupling coefficient are determined; S6, a detuning factor of each loop is defined; S7, a discriminant D is calculated; S8, the optimal detuning factor is determined according to the discriminant; S9, according to the optimal detuning factor, the capacitance values of a relay coil compensator capacitor and a receiving coil compensation capacitor are determined; and S10, the feasibility of all parameters of the system is verified. The single-relay wireless energy transmission system parameter design method provided by the invention has the effects thatthe method is suitable for systems of any frequency, the orientation robustness of the system is greatly improved, and the system design can be effectively guided.