A tunable antenna applicable to a communications terminal, wherein the tunable antenna comprises a radio frequency integrated circuit, a first frequency modulation branch (50a, 50b) separately connected to the radio frequency integrated circuit, a first antenna, a second antenna and a second frequency modulation branch, wherein the first antenna is connected to the radio frequency integrated circuit through the first frequency modulation branch (50a, 50b); wherein the second antenna is connected to the radio frequency integrated circuit through the second frequency modulation branch; wherein the first antenna corresponds to a first frequency, the second antenna corresponds to a second frequency, and the first frequency and the second frequency are respectively a transmit frequency and a receive frequency in a specified frequency band; wherein the first frequency modulation branch (50a, 50b) comprises: a plurality of first frequency band branches (51a, 51b), wherein the plurality of first frequency band branches (51a, 51b) correspond to different frequency bands, one end of each first frequency band branch (51a, 51b) is connected to the first antenna through a first selector switch, and the other end is connected to the radio frequency integrated circuit through a second selector switch (52a, 52b); wherein the second frequency modulation branch comprises a plurality of second frequency band branches, the plurality of second frequency band branches correspond to different frequency bands, one end of each second frequency band branch is connected to the radio frequency integrated circuit, and the other end is connected to the second antenna through a third selector switch; and wherein the second antenna is a full-band antenna configured to receive signals in a plurality of frequency bands. wherein the first antenna is connected to the radio frequency integrated circuit through the first frequency modulation branch (50a, 50b); wherein the second antenna is connected to the radio frequency integrated circuit through the second frequency modulation branch; wherein the first antenna corresponds to a first frequency, the second antenna corresponds to a second frequency, and the first frequency and the second frequency are respectively a transmit frequency and a receive frequency in a specified frequency band; wherein the first frequency modulation branch (50a, 50b) comprises: a plurality of first frequency band branches (51a, 51b), wherein the plurality of first frequency band branches (51a, 51b) correspond to different frequency bands, one end of each first frequency band branch (51a, 51b) is connected to the first antenna through a first selector switch, and the other end is connected to the radio frequency integrated circuit through a second selector switch (52a, 52b); wherein the second frequency modulation branch comprises a plurality of second frequency band branches, the plurality of second frequency band branches correspond to different frequency bands, one end of each second frequency band branch is connected to the radio frequency integrated circuit, and the other end is connected to the second antenna through a third selector switch; and wherein the second antenna is a full-band antenna configured to receive signals in a plurality of frequency bands. a plurality of first frequency band branches (51a, 51b), wherein the plurality of first frequency band branches (51a, 51b) correspond to different frequency bands, one end of each first frequency band branch (51a, 51b) is connected to the first antenna through a first selector switch, and the other end is connected to the radio frequency integrated circuit through a second selector switch (52a, 52b); wherein the second frequency modulation branch comprises a plurality of second frequency band branches, the plurality of second frequency band branches correspond to different frequency bands, one end of each second frequency band branch is connected to the radio frequency integrated circuit, and the other end is connected to the second antenna through a third selector switch; and wherein the second antenna is a full-band antenna configured to receive signals in a plurality of frequency bands.