Capacitors inherently have manufacturing tolerances and are more susceptible to temperature, humidity, and aging. The output characteristic of the wireless power transfer system can be affected by the variations in resonant capacitors. A global sensitivity analysis of multirelay magnetic coupling wireless power transfer (MC-WPT) system is presented in this paper. The sensitivity of output current, transfer efficiency, and power factor to capacitor variations is analyzed based on the sobol’ method. The first-order indices are calculated to evaluated the effect of capacitance deviation on the system characteristics. It found that the output current and power factor are almost insensitivity to variations in capacitor of the receiving coil. Efficiency is almost insensitivity to variations in a capacitor of the transmitter coil, the sensitivity of efficiency to receiving coil capacitance is low, and the sensitivity of efficiency to relay coil capacitance is high. As an increase in the number of coils, the sensitivity of the multirelay WPT system to capacitance deviations decreases, and the robustness of the system increases.