The utility model relates to the technical field of air energy low-temperature condensate water anti-freezing devices, in particular to a heat preservation structure and an air energy low-temperature condensate water anti-freezing device.According to the heat preservation structure, a butt joint block is arranged on the surface of a first heat preservation layer, a butt joint groove is formed in the surface of a second heat preservation layer, a protection plate and a first positioning block are arranged on the surface of a first shell, and a second positioning block is arranged on the surface of a second shell; a mounting groove and a positioning hole are formed in the surface of the shell II, and an anti-falling groove is formed in the surface of the bolt; the heat preservation device has the beneficial effects that the first shell is clamped to the first heat preservation layer, the second shell is clamped to the second heat preservation layer, the first shell and the second shell are protected, the first shell and the second shell are connected together through bolts to be fixed, and the situation that the first heat preservation layer and the second heat preservation layer are damaged due to collision of external objects is avoided; and the bolt is arranged in the anti-falling groove through the limiting block to limit the bolt, so that the situation that the bolt is loosened, falls off and is lost during screwing is effectively avoided.