The invention discloses a multi-input multi-output power equalization method for a 4T4R symmetric antenna system. The system comprises a symmetrical four-path transmission and power equalization module and a symmetrical four-path broadband antenna module; the symmetrical four-path transmission and power equalization module is used for generating first radio frequency signals, second radio frequency signals, third radio frequency signals and fourth radio frequency signals which have equal amplitude, equal frequency and the same phase and sending the signals to the symmetrical four-path broadband antenna module; the symmetrical four-way broadband antenna module is used for receiving the first radio frequency signals, the second radio frequency signals, the third radio frequency signals and the fourth radio frequency signals and sending the first radiation signals, the second radiation signals, the third radiation signals and the fourth radiation signals. According to the multi-input multi-output power equalization method for the 4T4R symmetric antenna system of the invention, four paths of radiation signals with are consistent in amplitude, phase and coverage range are formed in thespace, so that a mobile terminal can receive the four paths of radiation signals with equal amplitude and phase when moving in a signal coverage range, and a good indoor coverage effect is realized.