The invention discloses a hemming device for clothes manufacturing. The device comprises a base, a fixing box is arranged at the top end of the base, two first through holes are formed in one side ofthe fixing box, push plates are arranged at the positions, with the first through holes, of the fixing box, the push plates extend to the outside of the fixing box at the positions of the first through holes, one ends of the two push plates are fixedly connected with a same connecting rod, first springs are fixedly connected between the push plates and the inner wall of one side of the fixing box,the push palates are L-shaped, two strip-shaped through holes are formed in the top end of the fixing box, the push plates extend to the top end of the fixing box at the positions of the strip-shapedthrough holes, strip-shaped through holes are formed in one side of the fixing box, a rotation shaft is fixedly connected to one side of the connecting rod, and a clamping plate is fixedly connectedto the outer wall of the rotation shaft. Compared with an existing device, the device provided by the invention has the advantages that the connecting rod and the pushing plates are arranged, by pushing the pushing plates, the connecting rod is driven to move, and therefore, the hemming width is changed by changing the width of the fixing box.