The invention discloses a device for realizing beamforming by utilizing MIMO (multiple input multiple output) at a 4G (fourth generation) mobile terminal, relates to the technical field of mobile communication and particularly relates to a device for realizing beamforming by utilizing MIMO at a 4G mobile terminal. The device for realizing beamforming by utilizing the MIMO at the 4G mobile terminal is formed by connecting a feed system, a power divider, a phase shifter, a T/R (transmitter/receiver) assembly and an antenna, wherein the feed system is connected with the power divider, and the phase shifter is connected with the power divider; and the power divider is connected with the T/R assembly, and the T/R assembly is connected with the antenna. The device disclosed by the invention can fully utilize space resources by use of an MIMO technology and can be used for effectively resisting the influence of wireless channel fading and greatly improving the system frequency spectrum resource utilization rate and the channel capacity under the condition of not increasing the system bandwidth and the total transmission power of the antenna; and an innovative design is adopted, so that the system performance is improved, simultaneously the circuit complexity is reduced and the system cost is lowered.