The receiving coil of dynamic wireless charging (DWC) systems of electric vehicles will be offset relative to the transmitting coil, which will cause a decrease in mutual inductance and thus a decrease in output power. The conventional solution is to add a buck converter on the energy receiving side to compensate for the power drop. Indeed, the receiving-side buck converter is a nonlinear structure, and the corresponding nonlinear control strategy study is required. In addition, the rapid and large-range changes in the mutual inductance of the DWC system will also increase the control difficulty. To solve these problems, we propose a feedback linearization control (FLC) algorithm for the buck converter on the receiving side of the DWC system. We carry out detailed modeling of the receiving-side buck converter, linearize the relationship between input and output, and analyze the stability of the controlled system. The results show that the adjustment speed of the proposed FLC is fast, and it is suitable for the DWC system. Moreover, when the mutual inductance changes rapidly in a wide range, the controlled output of the receiving-side buck converter can still track the reference value stably, demonstrating the effectiveness and superiority of the proposed FLC algorithm.