The utility model discloses a layered steam oven, including box, lid, tray, support unit and heating unit, be provided with installation cavity in the box, install the inner bag in the installation cavity, the opening of outside intercommunication is established to the inner bag side, the lid one end rotatablely installed in opening, the tray sets up in the inner bag, and suitable with the space division of inner bag is a plurality of heating cavities, the edge of tray is provided with sealing element, sealing element adopts elastic material to make, sealing element is suitable under the pressure of lid and blocks the gap between tray and the inner bag lateral wall and tray and lid, the support unit, including a plurality of adjustable bracket that set up in the inner bag lateral wall, this layered steam oven can satisfy different size and kind food heating need, effectively avoid the mutual string smell of food in the heating process, and can improve the heating speed.