The invention discloses a low-temperature antifreeze coating for a ceramic and glass insulator and a preparation method thereof. The low-temperature antifreeze coating comprises a SiO2 film layer arranged on the outer surface of an insulator and a fluorine-containing organic matter film layer arranged on the SiO2 film layer, wherein a C-SiO2 graphite film layer is arranged outside the fluorine-containing organic matter film layer. The preparation method comprises the following steps: coating the outer surface of the insulator body with a SiO2 film layer, coating the film layer with a fluorine-containing organic matter film layer, and coating graphite and the SiO2 film layer. The two-layer structure is changed into a three-layer structure, 0 DEG C water drops collide with the surface of the coating and rapidly drop, no water drop residue is left on the surface of the coating, the experimental process can last for about 150 minutes, the coating keeps good hydrophobic performance at a low temperature, freezing rain is effectively prevented from freezing on the surface of the coating, and the coating has frosting resistance, freezing rain resistance and self-cleaning capacity.