In this paper, an enhanced Parity-Time (PT) symmetry method with cross-coupling is proposed to address the issues of low transmission efficiency. On this basis, this approach is applied to the three-coil wireless power transfer (WPT) system to address the high magnetic leakage in traditional long-distance two-coil wireless charging. Firstly, an equivalent circuit model of the three-coil WPT system based on the PT symmetry principle is established, ensuring constant output power and transmission efficiency. Then, the transmission distance characteristics of the cross coupled three-coil WPT system are analyzed. The theoretical analysis has indicated that a more accurate critical coupling coefficient is obtained through the mutual inductance ratio between adjacent and non-adjacent coils. To verify the effectiveness of theoretical analysis, a 40 W three-coil experimental prototype is built. The experimental results indicate that a system output power of 40 W and transmission efficiency of 84% are achieved within a transmission distance of 190 mm.