Aiming at the problem of unstable output voltage caused by coil offset and input voltage fluctuation of MCR-WPT in actual operation, a constant voltage control method based on mutual inductance recognition is proposed. This method does not require communication. The proposed approach enables mutual inductance estimation in the MCR-WPT system solely through monitoring the inverter full-bridge’s DC input voltage and primary-side current, thereby deriving output voltage characteristics. Concurrently, a BOOST converter is cascaded upstream of the inverter stage, with output voltage regulation accomplished via duty cycle adjustment of the BOOST circuit. The article first models and analyzes the SS topology of the MCR-WPT system. Then, open-loop and closed-loop simulations are carried out in Simulink to verify the feasibility of the proposed method. Finally, in the experiment, it is achieved that the output voltage can still be maintained constant by changing the lateral and longitudinal offset distances of the wireless transmission coil and the input voltage.