The present invention relates to a through-wall refrigerator which includes a refrigerator body, a wall-cavity inside a house-external wall for resettlement of the refrigerator body, an environmental temperature space that is inside the wall-cavity and surrounding the refrigerator body, a wall-cavity rear cover covering the rear side of the refrigerator body being adjacent to the outdoor environment, a frame-shaped partition plate sealed between the indoor side of the sidewall of the wall-cavity and the door frame of the refrigerator body isolating the environmental temperature space from the indoor environment, and an outdoor cold air refrigeration system, wherein the refrigerator door is towards the indoor. The present invention also relates to a temperature control method for the through-wall refrigerator, the refrigerator energy saving is realized by that the temperature of the environmental temperature space of the through-wall refrigerator is low when the outdoor temperature is low, and that the outdoor cold air aids for refrigeration; the through-wall refrigerator can also be normally used when the outdoor temperature is higher. Meanwhile the refrigerator occupied indoor area and space and the refrigerator magnetic field harmfulness on the users are reduced.