To provide a food baking oven of a prefabricated polyhedron dome shape, which is a prefabricated type, can be easily constructed, is a highly strong and stable dome shape and has a hardly shifting connection structure, and whose each component has an accurately producible and mass producible shape and whose food baking oven can efficiently reserve combustion heat of firewood.

There is provided a food baking oven of a prefabricated polyhedron dome shape, wherein each composing component can be plurally produced with a mold from a protean refractory material, and wherein the oven is simply constructed with a prefabrication mode by mounting, adjoining, inserting and fitting on the heat-insulating floor plate surface, hearth components and polyhedron dome wall components having a tongue-and-groove joint structure, and on the front of the oven, oven outlet components, oven outlet upper dome wall components, oven outlet left dome wall components and oven outlet right dome wall components, and has a combustion supporting device.