The invention discloses an anti-freezing method suitable for a polar sailing ship. The anti-freezing method is characterized in that the anti-freezing manner for pipelines is a mixed composition manner formed by combining adjoining-pipe anti-freezing structure heating, heat preservation materials, a residue discharging method and a gas drying method; the anti-freezing manner for mechanical compartments and liquid tanks is a mixed composition manner formed by combining steam heating, electric heating, electric heaters and the heat preservation materials; the anti-freezing manner for equipment is a mixed composition manner formed by combining heating and enclosed protection; the anti-freezing manner for channels is formed by the electric heating and the enclosed protection or a mixed combination of the electric heating and the enclosed protection. The method disclosed by the invention has the advantages that on the consideration of pipeline systems, the mechanical compartments, the liquid tanks, the equipment and the channels and the like, various important systems and equipment of the polar sailing ship are effectively guaranteed to normally operate in severe environments, such as low air temperature, low water temperature and the like, and functions of various compartments and channels are not influenced, therefore the polar sailing ship is guaranteed to safely sail in cold sea areas.