The utility model discloses a belt folding machine and a belt clamping and folding assembly of the belt folding machine, the belt clamping and folding assembly comprises a support, a rotating piece, apoking piece, a clamping jaw and an inserting piece, and the rotating piece is connected to the support; a blocking part is arranged at one end of the poking piece and is arranged above or below theclamping end of the clamping jaw; the inserting piece is arranged on one side of the opening of the clamping jaw and connected with a telescopic power piece, and the telescopic power piece is used fordriving the inserting piece to be away from and/or close to the clamping end of the clamping jaw. The rotating piece is used for driving the poking piece to rotate or used for driving the clamping jaw and the inserting piece to rotate synchronously. On the material belt, the part of the empty plug-in serves as a bending position and is used for pressing of the presser foot, good allowance is achieved when the presser foot is pressed, and the clamping jaw is not prone to being pressed by the presser foot; the material belt is good in overturning quality and precision, good in pressing qualityand precision when being fed into the sewing assembly, good in sewing quality and attractive in appearance.