In Magnetically Coupled Resonant Wireless Power Transfer (MCR-WPT) systems, the frequency splitting phenomenon occurring under strong coupling conditions provides a pathway for multi-load power supply but concurrently reduces transmission efficiency. To address the power supply requirements for multi-frequency loads, this paper proposes a grouped multi-frequency wireless charging method based on frequency splitting. For the introduced adjustment coil (AX), two adjustment modes (axial displacement and lateral displacement) are designed to achieve switching between different loads by altering the coupling coefficients. Theoretical analysis, circuit modeling, finite element simulation, and experimental validation were conducted. The results demonstrate that when the system input DC voltage is 10 V, the two load coils receive power levels of 1.2 W and 1.4 W, respectively, with negligible crosstalk. This work provides an effective solution for selective directional energy supply to multi-frequency micro-devices, such as endoscopic robots.