Aiming at the problems of low efficiency, weak anti-offset capability and poor load adaptability of dynamic wireless power transmission of electric vehicles, this paper proposes an innovative system integrating adaptive tuning and asymmetric magnetic coupling structure. The electromagnetic field-thermal field coupling model is constructed, the dynamic equivalent circuit equation is derived, and the frequency tracking strategy and magnetic shielding focusing structure based on the particle swarm optimization algorithm are designed. The simulation results shows that under the conditions of 20 cm transmission distance and 15 cm horizontal offset, the system transmission efficiency reaches 85.2%, which is 21.37% higher than the traditional structure; when the load changes dynamically between 10-50 Ω, the output power fluctuation is controlled within ±2.1%, and the transmission efficiency fluctuation is ±1.8%. The experimental platform is built for verification, and the error between the experimental results and the simulation data is within the range of ±5%.