A switching method adopting a mobile terminal switching antenna, wherein the mobile terminal switching antenna comprises an antenna; a radio-frequency module; a baseband chip utilized to provide a control signal; a voltage dividing module utilized to perform voltage division for the control signal; a noise barrier module utilized to perform noise barrier for the control signal; a direct current blocking module utilized to block a DC signal from entering the antenna; a unidirectional conduction module utilized to unidirectionally conduct the control signal; and an antenna matching module utilized to match and tune the antenna while switching the antenna; wherein the baseband chip is coupled to the antenna via the RF module; the baseband chip is coupled to the antenna sequentially via the voltage dividing module, the noise barrier module, and the DC blocking module; and the baseband chip is grounded sequentially via the voltage dividing module, the noise barrier module, the unidirectional conduction module, and the antenna matching module; the switching method is characterized in that the switching method comprises the following steps: A, receiving a radio-frequency signal given by a base station and scanning each frequency band by the mobile terminal; B, determining whether the currently scanned frequency band is in a plurality of working frequency bands, which are comprised in a first operative state of the antenna when the baseband chip does not output the control signal, if so, then performing step C; if not, then performing step D; C, working in the first operative state by the antenna of the mobile terminal, and when the radio-frequency signal which is given by the base station and received by the mobile terminal is consistent with information of the frequency band of an operator desired by a SIM card of the mobile terminal, registering to a network for the mobile terminal working properly; and D, outputting the control signal by the baseband chip, the antenna of the mobile terminal being in a second operative state which comprises another plurality of working frequency bands, and scanning each of the frequency bands individually by the mobile terminal, when the radio-frequency signal which is given by the base station and received by the mobile terminal is consistent with the information of the frequency band of the operator desired by the SIM card of the mobile terminal, registering to the network for the mobile terminal working properly. an antenna; a radio-frequency module; a baseband chip utilized to provide a control signal; a voltage dividing module utilized to perform voltage division for the control signal; a noise barrier module utilized to perform noise barrier for the control signal; a direct current blocking module utilized to block a DC signal from entering the antenna; a unidirectional conduction module utilized to unidirectionally conduct the control signal; and an antenna matching module utilized to match and tune the antenna while switching the antenna; wherein the baseband chip is coupled to the antenna via the RF module; the baseband chip is coupled to the antenna sequentially via the voltage dividing module, the noise barrier module, and the DC blocking module; and the baseband chip is grounded sequentially via the voltage dividing module, the noise barrier module, the unidirectional conduction module, and the antenna matching module; A, receiving a radio-frequency signal given by a base station and scanning each frequency band by the mobile terminal; B, determining whether the currently scanned frequency band is in a plurality of working frequency bands, which are comprised in a first operative state of the antenna when the baseband chip does not output the control signal, if so, then performing step C; if not, then performing step D; C, working in the first operative state by the antenna of the mobile terminal, and when the radio-frequency signal which is given by the base station and received by the mobile terminal is consistent with information of the frequency band of an operator desired by a SIM card of the mobile terminal, registering to a network for the mobile terminal working properly; and D, outputting the control signal by the baseband chip, the antenna of the mobile terminal being in a second operative state which comprises another plurality of working frequency bands, and scanning each of the frequency bands individually by the mobile terminal, when the radio-frequency signal which is given by the base station and received by the mobile terminal is consistent with the information of the frequency band of the operator desired by the SIM card of the mobile terminal, registering to the network for the mobile terminal working properly.