The utility model discloses an edge folding machine. Including a frame, a cross beam is arranged in the rack; a die pressing device is arranged on the cross beam; the pressing die device comprises a lower pressing die arranged on the top side of the cross beam, an upper pressing die arranged over the lower pressing die, a die locking plate connected with the upper pressing die in an up-down buckling mode, and a die locking cylinder connected with the die locking plate in a transmission mode. An upper pressing beam is arranged above the cross beam; one side of the upper pressing beam is in transmission connection with a pressing cylinder; a horizontal hanging plate is arranged on the bottom side of the upper pressing beam; the die locking cylinder is fixedly arranged on one side of the upper pressing beam, the multiple upper pressing dies are connected to one side of the horizontal hanging plate through buckles, the die locking device is tight in structural connection, adjustment and fixation of the die locking device are more convenient, complex operation procedures such as unlocking and locking are reduced, and the machining efficiency is improved.