The embodiment of the invention discloses a magnetic-resonance radio frequency coil adjustment method, a magnetic resonance scanning system, and a medium. The method comprises the steps: a, obtaining a radio frequency signal received by a magnetic-resonance radio frequency coil, wherein the radio frequency coil comprises a plurality of radio frequency coil units; b, calculating the coupling relevant parameters of the radio frequency coil units according to the radio frequency signal; c, adjusting the corresponding coil unit meeting a preset condition to be detuned according to the coupling relevant parameters. According to the embodiment of the invention, the method improves the decoupling efficiency, and the decoupling at any position guarantees the accuracy of scanning data obtained by the coil units, thereby improving the quality of an image obtained through the scanning data of the coil units, and improving the signal to noise ratio of the image.