The invention discloses an indoor wireless energy transmission system and a wireless energy transmission method. The energy transmission system comprises a power receiving end and a power transmitting end, wherein the power transmitting end is composed of a power transmitting array, a signal analysis circuit, a signal processing module, a variable power amplifier and a power monitoring module; the power transmitting array in a receiving mode is sequentially connected with the signal analysis circuit, the signal processing module, the variable power amplifier and the power monitoring module; the power transmitting array in a transmitting mode is connected with the variable power amplifier; and the power receiving end is composed of multiple to-be-charged devices, and each to-be-charged device is composed of an energy receiving antenna and a rectifier circuit. The problems that the traditional method of using electromagnetic wave propagation for wireless energy transmission is only applied to a power transmitting array formed by antennas by regularly-arranged units with the same structure, single-frequency operation exists, the multi-target beam optimization time is long, serious interference is generated to a device in no need of charging, and safety of a person, an animal, a plant and a device in no need of charging in the energy transmission space can not be ensured can be solved.