A hinge mechanism, applied to a foldable mobile terminal, wherein the hinge mechanism comprises: a main shaft component; a swing arm component, comprising at least one swing arm group, wherein each swing arm group comprises swing arms (12a, 12b) correspondingly disposed on both sides of the main shaft component, the swing arm (12a, 12b) is rotatably connected to the main shaft component, and axes around which the swing arms (12a, 12b) on both sides of the main shaft component rotate are different and are separately parallel to an extension direction of the main shaft component; and a synchronization component, wherein the synchronization component and the swing arm component are correspondingly disposed, the synchronization component comprises synchronization arms (13a, 13b) separately disposed on both sides of the main shaft component, and two synchronization arms (13a, 13b) are geared; and each synchronization arm (13a, 13b) is slidably connected to a swing arm (12a, 12b) on a same side as the synchronization arm (13a, 13b), and may rotate with the swing arm (12a, 12b) on the corresponding side, characterised in that, a plurality of limiting grooves are disposed on a sidewall that is of the synchronization arm (13a, 13b) and that faces the swing arm (12a, 12b); and wherein the hinge mechanism further comprises an elastic component, the elastic component is disposed between the swing arm (12a, 12b) and the synchronization arm (13a, 13b) on a same side as the elastic component, and comprises a ball and an elastic mechanical part abutting against each other, one end of the elastic mechanical part abuts against the swing arm (12a, 12b) and the other end abuts against the ball, and the ball is adapted to roll along a sidewall that is of the synchronisation arm (13a, 13b) and that is close to the swing arm (12a, 12b). a main shaft component; a swing arm component, comprising at least one swing arm group, wherein each swing arm group comprises swing arms (12a, 12b) correspondingly disposed on both sides of the main shaft component, the swing arm (12a, 12b) is rotatably connected to the main shaft component, and axes around which the swing arms (12a, 12b) on both sides of the main shaft component rotate are different and are separately parallel to an extension direction of the main shaft component; and a synchronization component, wherein the synchronization component and the swing arm component are correspondingly disposed, the synchronization component comprises synchronization arms (13a, 13b) separately disposed on both sides of the main shaft component, and two synchronization arms (13a, 13b) are geared; and each synchronization arm (13a, 13b) is slidably connected to a swing arm (12a, 12b) on a same side as the synchronization arm (13a, 13b), and may rotate with the swing arm (12a, 12b) on the corresponding side, characterised in that, a plurality of limiting grooves are disposed on a sidewall that is of the synchronization arm (13a, 13b) and that faces the swing arm (12a, 12b); and wherein the hinge mechanism further comprises an elastic component, the elastic component is disposed between the swing arm (12a, 12b) and the synchronization arm (13a, 13b) on a same side as the elastic component, and comprises a ball and an elastic mechanical part abutting against each other, one end of the elastic mechanical part abuts against the swing arm (12a, 12b) and the other end abuts against the ball, and the ball is adapted to roll along a sidewall that is of the synchronisation arm (13a, 13b) and that is close to the swing arm (12a, 12b).