The invention discloses a brushless excitation mechanism based on wireless transmission of electric energy. The mechanism comprises a high frequency excitation source, an auxiliary excitation transmitting coil, an auxiliary excitation receiving coil, a rotating rectifier bridge, a soft magnetism optimization layer and a metal shielding layer, wherein the high frequency excitation source and the auxiliary excitation transmitting coil are arranged outside a motor, the auxiliary excitation receiving coil, the rotating rectifier bridge, the soft magnetism optimization layer and the metal shielding layer are arranged in the motor, an electromagnetic field of an excitation system is optimized and shielded through soft magnetism materials and metal materials, an excitation coil of a rotor of the alternating-current motor is supplied with power through the wireless transmission of the electric energy, mechanical connection between the rotor and external terminals is avoided, and brushless excitation of the motor is achieved.