The invention discloses an energy-saving, stereo, multi-layer and intelligent plant factory which comprises a workshop, a planting bed and a temperature rising, sterilization, disinfection and automatic lifting light supplementing device. Four layers of solar panels are used at the top of the workshop, a heat preservation curtain is laid on the solar panels, the solar panel thickness is 10 mm, the temperature rising curtain is black and absorbs light, a temperature rising chamber is formed between the solar panels and the temperature rising curtain, holes are formed in the temperature rising curtain, and the temperature rising curtain corresponds to a circulation fan in size and position. Multiple layers of planting grooves and an automatic nutrient solution circulating system are arranged on a planting bed main frame, galvanized steel pipes are arranged below each layer of planting grooves, upper and lower layers of parallel galvanized steel pipes are connected through one longitudinal water feeding pipe and one longitudinal water return pipe, and vertical indoor-temperature balance is achieved through same-way circulation. Planting cell plates are arranged above easy layer, automatic light supplementing lamp adjusting and lifting frames are installed on the planting cell plates, and light supplementing lamp tubes are installed at the bottoms of the lifting frames. The plant factory is small in earlier stage investment, low in operation cost and low in energy consumption.