The invention relates to a stepping infant complementary food machine. The machine comprises a handle, a screw rod, a stepping rod, a food bag, an upper cover, a lower cover and a protection cover; the upper cover is connected with the lower cover to form a shell, a buckle ring of the protection cover is connected with a fixed groove of the lower cover, the handle penetrates through an upper opening of the upper cover, the screw rod is located in the shell, the stepping rod is located in the food bag which penetrates through a lower opening of the lower cover, an output hole of the food bag is located in the protection cover, an actuating rod of the handle is embedded into an actuating groove of the screw rod, an external thread of the screw rod is connected with an internal thread of the stepping rod. The complementary food machine is simple in structure, the material cost and manufacturing cost are reduced, parts are not likely to be lost, assembling and disassembling of all the parts are conducted easily and conveniently, and cleaning is conducted conveniently.