The invention belongs to the field of food packaging, particularly relates to a preparation method of a high-temperature-resistant, high-water-resistant and anti-deformation paper container, and provides the following scheme aiming at the problems that an existing paper container is not resistant to high temperature, poor in water resistance, poor in oil resistance and prone to deformation. The method comprises the following steps that a first batch hopper, a first forming hopper, a second batch hopper, a second forming hopper, a multi-layer headbox and sizing equipment are prepared, chitosan, microcrystalline cellulose and lactitol are used for improving the oil resistance of paper, high-temperature-resistant powder is used for improving the high-temperature-resistant capacity of a paper container, the paper is prevented from becoming brittle, and the paper container is made of paper. A waterproof film can be formed on the surface of the paper container through the surface sizing liquid, the waterproof capacity of the paper container is enhanced, the paper container has the advantages of high temperature resistance, water resistance and oil resistance, meanwhile, a double-layer structure is adopted, strength is high, toughness is good, impact resistance is achieved, stability is high, and the manufactured paper container is not prone to deformation.