The invention discloses a preparation method of fire-proof binging belt. The preparation method comprises the following steps that steel belts made by cold rolling alloy steel are carried out high temperature austenitizing, quenching and tempering are carried out in sequence, a ZrO2 layer is deposited on the surface of the steel belts by using physical vapor deposition, then a Al2O3-SiO2 layer covers the surface of the ZrO2 layer by using thermal spraying method. The fire-proof belts prepared by the method have high strength, good electrical insulation property, thermal insulation property, heat resistance quality and thermal shock resistance.