An anti-reverse mechanism for a lacing device, comprising: one or more gaps (6511, 6512) arranged along a circumference; a swing arm elastic component, comprising an elastic member and one or more swing arms arranged along a circumference, wherein the elastic member is connected to the swing arm; the swing arm comprises at least a swing arm head and a swing arm beam, and the swing arm beam extends outward in a radial direction of the circumference; the swing arm comprises a first side and a second side, wherein the first side and the second side are opposite, the swing arm head is configured to engage the gap (6511, 6512) when the swing arm is in an original position, and the swing arm head and/or the swing arm beam are/is configured to deviate from the original position in a first direction towards the first side or in an opposite second direction towards the second side of the swing arm; and one or more stop pieces, wherein the stop piece is located on the first side of the swing arm, and the stop piece and the swing arm are located on a same part and are arranged separately; and characterized in that the stop piece comprises a wedge-shaped head and a base portion, the wedge-shaped head of the stop piece is arranged corresponding to the swing arm head, and the base portion of the stop piece is arranged corresponding to the swing arm beam; when the gap (6511, 6512) or the swing arm is subjected to an external force in the tensioning direction, the stop piece and the elastic member are configured to allow displacement of the swing arm relative to the gap (6511, 6512) until the swing arm head is disengaged from the gap (6511, 6512) to allow the gap (6511, 6512) or the swing arm to rotate in the tensioning direction; and when the gap (6511, 6512) or the swing arm is subjected to an external force in the loosening direction, the external force in the loosening direction is configured to cause a side wall of the gap (6511, 6512) to exert bias pressure on the swing arm head to deviate the swing arm head toward the first side, at least part of the swing arm head abuts against the wedge-shaped head of the stop piece, the wedge-shaped head of the stop piece prevents the swing arm head from deviating towards widely to the first side, the base portion of the stop piece prevents the swing arm beam from deviating towards the first side, and the swing arm head always remains engaged with the gap (6511, 6512) to prevent the gap (6511, 6512) or the swing arm from rotating in the loosening direction. one or more gaps (6511, 6512) arranged along a circumference; a swing arm elastic component, comprising an elastic member and one or more swing arms arranged along a circumference, wherein the elastic member is connected to the swing arm; the swing arm comprises at least a swing arm head and a swing arm beam, and the swing arm beam extends outward in a radial direction of the circumference; the swing arm comprises a first side and a second side, wherein the first side and the second side are opposite, the swing arm head is configured to engage the gap (6511, 6512) when the swing arm is in an original position, and the swing arm head and/or the swing arm beam are/is configured to deviate from the original position in a first direction towards the first side or in an opposite second direction towards the second side of the swing arm; and one or more stop pieces, wherein the stop piece is located on the first side of the swing arm, and the stop piece and the swing arm are located on a same part and are arranged separately; and characterized in that the stop piece comprises a wedge-shaped head and a base portion, the wedge-shaped head of the stop piece is arranged corresponding to the swing arm head, and the base portion of the stop piece is arranged corresponding to the swing arm beam; when the gap (6511, 6512) or the swing arm is subjected to an external force in the tensioning direction, the stop piece and the elastic member are configured to allow displacement of the swing arm relative to the gap (6511, 6512) until the swing arm head is disengaged from the gap (6511, 6512) to allow the gap (6511, 6512) or the swing arm to rotate in the tensioning direction; and when the gap (6511, 6512) or the swing arm is subjected to an external force in the loosening direction, the external force in the loosening direction is configured to cause a side wall of the gap (6511, 6512) to exert bias pressure on the swing arm head to deviate the swing arm head toward the first side, at least part of the swing arm head abuts against the wedge-shaped head of the stop piece, the wedge-shaped head of the stop piece prevents the swing arm head from deviating towards widely to the first side, the base portion of the stop piece prevents the swing arm beam from deviating towards the first side, and the swing arm head always remains engaged with the gap (6511, 6512) to prevent the gap (6511, 6512) or the swing arm from rotating in the loosening direction.