Abstract: The invention relates to a fire-resistant and heat-insulating door/wall structure, which is installed inside a hollow door plank or wallboard frame that is made of a refractory material. The characteristic of the invention lies in that the fire-resistant and heat-insulating structure is in the form of board enabling at least a foamed block board to have a layer of cement insulated material attached thereto. The cement insulated material is made up of mixing thermally expansible material with other organic or inorganic fire-resistance. Accordingly, when the invention is burning by a fire, the foamed block board is rapidly melted by the heat, and at the same time, the heat enables the cement insulated material to inflate and fill the inner frame instantly. Thus the invention enables the frame to be filled compactly with the cement insulated material after inflation, so as to possess better fire-resistant and heat-insulating effects.