The invention discloses an antenna device and a mobile terminal. The antenna device comprises a first irradiator, a first feed power supply, a first main lead, a second irradiator, a second feed power supply, a second main lead, a first auxiliary lead and a first switch. The first feed power supply is connected with the first irradiator through the first main lead; the second feed power supply is connected with the second irradiator through the second main lead; the first auxiliary lead is connected between the first irradiator and the second irradiator; and the first switch is arranged on the first auxiliary lead and is used for controlling the connection and disconnection of the first auxiliary lead. Signal reception capability of an antenna is enhanced, so that the antenna device is allowed to be suitable for complex work environment, and debugging flexibility is improved; and when one or more radiator is damaged, the undamaged radiator can keep a signal emission and reception function, thereby ensuring normal work of the device.