The invention provides a novel bag making die and belongs to the technical field of bag making processing. The novel bag making die comprises a die body, two die units are arranged between the two ends of the die body, each die unit comprises a heating power dispersion groove, each heating power dispersion groove comprises an edge heating power dispersion arc, the two end points of each edge heating power dispersion arc are each connected with one end of a heating power dispersion arc, the other end point of each heating power dispersion arc is located at the edge of the die body, and two groups of circular heating powder dispersion holes are symmetrically formed in the bottom of each edge heating power dispersion arc. The novel bag making die is simple in structure and capable of balancing heat balance of the die, so that heat sealing in the bag making process can be uniform, and an obtained bag is attractive in surface.