The disclosure discloses a dual-mode terminal antenna, comprising a main antenna comprising a main antenna of a first mode and a main antenna of a second mode, an auxiliary antenna comprising an auxiliary antenna of the first mode and an auxiliary antenna of the second mode, and an antenna bracket. The main and auxiliary antennas are fixed on a same antenna bracket, each of which is configured with a spring lea. When the antenna bracket is clasped on a main board, four spring leaves of the main and auxiliary antennas contact with four antenna feeding points on the main board respectively, An LC resonant circuit is disposed ahead of each antenna feeding point, and four LC resonant circuits resonate at a working frequency band of the antenna corresponding to the antenna feeding point with which each said LC resonant circuits connects, respectively. The disclosure also discloses a signal processing method, which solves signal interference and loss problems existed in an antenna of the prior art in a reception mode, through high impedance of the LC resonant circuit to the signal at different frequency bands. Furthermore, the dual-mode terminal antenna of the disclosure simplifies the layout of the Printed Circuit Board (PCB).