The invention discloses a method for designing a high allowable offset coupled resonator for wireless charging of an electric vehicle. The method comprises the following steps: determining the structure of a transmitting coil in the resonator; selecting the size of the transmitting coil; calculating the transmission efficiency eta0 in the center of the transmitting coil and the allowable offset T of a charging system, wherein the allowable offset T is a ratio of the transmission efficiency etas0 at the maximum offset distance s0 to the transmission efficiency eta0 in the center; calculating a system performance evaluation factor by endowing the allowable offset and the transmission efficiency in the center with different weights, and if the system performance evaluation factor is smaller than a set threshold, continuously modifying the size of the coil till reaching the set threshold. The allowable offset is introduced to evaluate the change trend of the charging efficiency along with the position offset, and the two indicators including the allowable offset and the transmission efficiency are balanced, so that effective guidance is provided for designing the high allowable offset coupled resonator, and the method has a wide application prospect in the wireless charging field of electric vehicles.