Antenna system and mobile terminal

An antenna system, including a metal frame including a radiation portion and a grounding portion separately arranged, and a gap zone is defined therebetween; a main board including a system ground, a first radio frequency feeding end and a second radio frequency feeding end; a first conductive member; a second conductive member; a three-in-one antenna unit; and a diversity antenna unit; the three-in-one antenna unit is connected with the first radio frequency feeding end, and the diversity antenna unit is electrically connected with the second radio frequency feeding end; the three-in-one antenna unit and the diversity antenna unit are connected with the radiation portion respectively through the first conductive member and the second conductive member; the radiation portion includes a first grounding point and a second grounding point which are connected with the system ground and arranged between the diversity antenna unit and the three-in-one antenna unit.