The invention relates to an impedance matching method, a master controlling terminal and an energy transmission system, being used for supplying energy to M controlled terminal devices, wherein M is a natural number. The impedance matching method comprises the following steps: firstly, an impedance matching circuit is provided with an equivalent impedance value so as to provide M energy signals to M controlled terminal devices; secondly, M feedback signals used for indicating the energy intensity received by the M controlled terminal devices are returned by the M controlled terminal devices; thirdly, the equivalent impedance value corresponding to the M feedback signals to the impedance matching circuit is recorded on a comparison table; fourthly, the equivalent impedance value of the impedance matching circuit is adjusted step by step, the steps are repeated for N times to record N feedback signals corresponding to each controlled terminal device, and N is a natural number and is greater than 1; and finally, the feedback signal in the N feedback signals for indicating the optimal energy intensity corresponding to each controlled terminal device is found out.