The invention discloses an energy-saving refrigerator. Based on the traditional no-frost air cooling refrigerator, the energy-saving refrigerator also comprises a cold air inlet channel, a cold air outlet channel, an outdoor temperature sensor, an inlet channel air door, an outlet channel air door, and a refrigerator control panel, wherein the cold air inlet channel is arranged on the rear of a freezer of the refrigerator; two ends of the cold air inlet channel are communicated with the inside of the refrigerator and outdoor cold air, and one end positioned outside the refrigerator body is connected with the outdoor temperature sensor; the cold air inlet channel on the refrigerator body is provided with the inlet channel air door; the cold air outlet channel is arranged on a correspondingpart of a bottom steel plate on the lower part of the refrigerator body; one end of the cold air outlet channel is communicated with the freezer, while the other end is connected with the outlet channel air door; the refrigerator control panel is connected with the outdoor temperature sensor, a refrigeration sensor, a freezing sensor, the inlet channel air door and the outlet channel air door; the refrigeration sensor is connected with a refrigeration air door; and the freezing sensor is connected with a compressor and a freezing fan. On the premise of ensuring food storage temperature, the energy-saving refrigerator fully utilizes ambient low-temperature cold sources so as to greatly save energy of the refrigerator and obviously reduce product noise.