An antenna selection method, applied to a terminal device, wherein the terminal device comprises a first antenna, a second antenna and a third antenna, the first antenna (ANTO) and the second antenna support an LTE communications network, and the third antenna supports a Wi-Fi communications network, and the method comprises: presetting, by the terminal device, antenna information and an antenna selection rule, wherein the antenna information comprises antenna isolation information, and the antenna isolation information comprises first isolation and second isolation, the first isolation is isolation between the first antenna (ANTO) and the third antenna, the second isolation is isolation between the second antenna and the third antenna; and selecting, by the terminal device, the antenna based on the antenna information and the antenna selection rule, wherein the antenna selection rule comprises: selecting, by the terminal device, the first antenna (ANTO) when the terminal device accesses only the LTE communications network; selecting, by the terminal device, the first antenna (ANTO) when the terminal device simultaneously accesses the LTE communications network and the Wi-Fi communications network, and there is no coexistence risk between the LTE communications network and the Wi-Fi communications network; selecting, by the terminal device, the first antenna (ANTO) when the terminal device simultaneously accesses the LTE communications network and the Wi-Fi communications network, there is a coexistence risk between the LTE communications network and the Wi-Fi communications network, and the first isolation is greater than the second isolation; and selecting, by the terminal device, the second antenna when the terminal device simultaneously accesses the LTE communications network and the Wi-Fi communications network, there is a coexistence risk between the LTE communications network and the Wi-Fi communications network, and when the second isolation is greater than the first isolation. presetting, by the terminal device, antenna information and an antenna selection rule, wherein the antenna information comprises antenna isolation information, and the antenna isolation information comprises first isolation and second isolation, the first isolation is isolation between the first antenna (ANTO) and the third antenna, the second isolation is isolation between the second antenna and the third antenna; and selecting, by the terminal device, the antenna based on the antenna information and the antenna selection rule, wherein the antenna selection rule comprises: selecting, by the terminal device, the first antenna (ANTO) when the terminal device accesses only the LTE communications network; selecting, by the terminal device, the first antenna (ANTO) when the terminal device simultaneously accesses the LTE communications network and the Wi-Fi communications network, and there is no coexistence risk between the LTE communications network and the Wi-Fi communications network; selecting, by the terminal device, the first antenna (ANTO) when the terminal device simultaneously accesses the LTE communications network and the Wi-Fi communications network, there is a coexistence risk between the LTE communications network and the Wi-Fi communications network, and the first isolation is greater than the second isolation; and selecting, by the terminal device, the second antenna when the terminal device simultaneously accesses the LTE communications network and the Wi-Fi communications network, there is a coexistence risk between the LTE communications network and the Wi-Fi communications network, and when the second isolation is greater than the first isolation. selecting, by the terminal device, the first antenna (ANTO) when the terminal device accesses only the LTE communications network; selecting, by the terminal device, the first antenna (ANTO) when the terminal device simultaneously accesses the LTE communications network and the Wi-Fi communications network, and there is no coexistence risk between the LTE communications network and the Wi-Fi communications network; selecting, by the terminal device, the first antenna (ANTO) when the terminal device simultaneously accesses the LTE communications network and the Wi-Fi communications network, there is a coexistence risk between the LTE communications network and the Wi-Fi communications network, and the first isolation is greater than the second isolation; and selecting, by the terminal device, the second antenna when the terminal device simultaneously accesses the LTE communications network and the Wi-Fi communications network, there is a coexistence risk between the LTE communications network and the Wi-Fi communications network, and when the second isolation is greater than the first isolation.