The utility model discloses a mould clout tensioning device, include: the bracing piece, articulate two arm lock at the bracing piece both ends respectively, the opposite side of two arm lock is equipped with and colludes the material tooth, the connection is at the regulation pole that is used for adjusting subtended angle between two arm lock between two arm lock, it pushes away the application of force screw rod that makes two arm lock recession to the mould to the mould to install to be used for pushing away on the bracing piece. The utility model discloses have: collude the design of material tooth, the baffle is remained in can be exchange swift take out, adjust the design of pole, guarantee the stability of centre gripping, the design of application of force screw rod prevents the mould and remains the baffle and lead to the fact further injury.