The wireless power transmission system based on nonlinear parity time symmetry is a robust system that can main-tain high-efficiency transmission at a certain distance. Parity-Time Symmetry (PT symmetry) wireless power transfer system, due to its insensitivity to the position of the coupled resonant coil over a large range, can carry out constant power transfer to the load, and through coupled mode theory The PT symmetrical wireless power transmission cir-cuit with S-P structure is analyzed, and the system has different transmission efficiencies in different coupling inter-vals, and the transmission effect of the structure at different distances is studied with the change of coupling coeffi-cient. Then, the simulation is carried out by MATLAB and origin software. The final results show that the transmis-sion efficiency does not change with the coupling coefficient in the strong coupling region and can maintain high-efficiency transmission. In the weak coupling region, the coupling coefficient has a great influence on the transmission efficiency of the system.