Embodiments of the present invention disclose a terminal device and a method for enhancing wireless performance of the terminal device. The terminal device comprises: N antennae for wireless communication; an antenna monitoring module for monitoring an antenna efficiency status signal and transmitting the detected antenna efficiency status signal to a processor; the processor connected separately to the antenna monitoring module and an antenna switch and used to determine, according to the antenna efficiency status signal, the antenna status of each antenna and to obtain the antenna efficiency index of each antenna corresponding to the antenna status; the processor is also used to select from the N antennae the antenna having the highest antenna efficiency index as the working antenna and to transmit the antenna identifier of the working antenna to the antenna switch; the antenna switch used to activate, according to the antenna identifier, the working antenna so that the terminal device performs wireless communications through the working antenna. Embodiments of the present invention can optimize the wireless performance of the terminal device.