A magnetic buckle structure for a knee-joint brace, comprising: a joint brace body; a lower magnetic buckle adapted to be arranged on the joint brace body; and an upper magnetic buckle adapted to be arranged on the lower magnetic buckle and magnetically connected to the lower magnetic buckle, wherein the lower magnetic buckle comprises: a lower magnetic buckle body integrally formed with the joint brace body; an upper magnetic buckle connection end arranged on an upper end surface of the lower magnetic buckle body along a height direction; and a lower magnet fixing end arranged on a lower end surface of the lower magnetic buckle body along the height direction, characterized in that the upper magnetic buckle connection end comprises: an upper magnetic buckle fitting part arranged on the upper end surface of the lower magnetic buckle body along the height direction; and a transverse baffle wall arranged on the upper magnetic buckle fitting part, and the upper magnetic buckle fitting part comprising a first groove, a first limit step and a second groove that are arranged in sequence; a first vertical baffle wall arranged on one end of the transverse baffle wall; a second vertical baffle wall arranged on the other end of the transverse baffle wall and symmetrical to the first vertical baffle wall; wherein the first vertical baffle wall and the second vertical baffle wall are gradually increased in height along one end close to the transverse baffle wall. a joint brace body; a lower magnetic buckle adapted to be arranged on the joint brace body; and an upper magnetic buckle adapted to be arranged on the lower magnetic buckle and magnetically connected to the lower magnetic buckle, wherein the lower magnetic buckle comprises: a lower magnetic buckle body integrally formed with the joint brace body; an upper magnetic buckle connection end arranged on an upper end surface of the lower magnetic buckle body along a height direction; and a lower magnet fixing end arranged on a lower end surface of the lower magnetic buckle body along the height direction, characterized in that the upper magnetic buckle connection end comprises: an upper magnetic buckle fitting part arranged on the upper end surface of the lower magnetic buckle body along the height direction; and a transverse baffle wall arranged on the upper magnetic buckle fitting part, and the upper magnetic buckle fitting part comprising a first groove, a first limit step and a second groove that are arranged in sequence; a first vertical baffle wall arranged on one end of the transverse baffle wall; a second vertical baffle wall arranged on the other end of the transverse baffle wall and symmetrical to the first vertical baffle wall; wherein the first vertical baffle wall and the second vertical baffle wall are gradually increased in height along one end close to the transverse baffle wall. a lower magnetic buckle body integrally formed with the joint brace body; an upper magnetic buckle connection end arranged on an upper end surface of the lower magnetic buckle body along a height direction; and a lower magnet fixing end arranged on a lower end surface of the lower magnetic buckle body along the height direction, characterized in that the upper magnetic buckle connection end comprises: an upper magnetic buckle fitting part arranged on the upper end surface of the lower magnetic buckle body along the height direction; and a transverse baffle wall arranged on the upper magnetic buckle fitting part, and the upper magnetic buckle fitting part comprising a first groove, a first limit step and a second groove that are arranged in sequence; a first vertical baffle wall arranged on one end of the transverse baffle wall; a second vertical baffle wall arranged on the other end of the transverse baffle wall and symmetrical to the first vertical baffle wall; wherein the first vertical baffle wall and the second vertical baffle wall are gradually increased in height along one end close to the transverse baffle wall. an upper magnetic buckle fitting part arranged on the upper end surface of the lower magnetic buckle body along the height direction; and a transverse baffle wall arranged on the upper magnetic buckle fitting part, and the upper magnetic buckle fitting part comprising a first groove, a first limit step and a second groove that are arranged in sequence; a first vertical baffle wall arranged on one end of the transverse baffle wall; a second vertical baffle wall arranged on the other end of the transverse baffle wall and symmetrical to the first vertical baffle wall; wherein the first vertical baffle wall and the second vertical baffle wall are gradually increased in height along one end close to the transverse baffle wall.