A kind of Puffing machine for foodstuff of the active of activity lower die and fixed Ccope closing machine, it is that Hou section sets feed inlet above the casing of what Puffing machine for foodstuff, top leading portion sets upper die holder, the upper die holder is fixed at least one upper mold, the opposite upper mold position is correspondingly provided with the lower die of identical quantity thereunder, the lower die is arranged the movable lower die holder of what one, the lower die holder by power source drive stroke upwards and Ccope closing machine, and by power source drive stroke downwards with upper moulding/demoulding.一種活動下模主動與固定上模合模的爆餅機，係於爆餅機的機殼上方後段設進料口，上方前段設上模座，該上模座固定設有至少一個上模，相對該上模位置在其下方對應設有相同數量的下模，該下模設置於一活動式下模座，該下模座受動力源驅動行程向上與上模合模，及受動力源驅動行程向下與上模脫模。
