The invention relates to the field of the metallurgical industry, and discloses a heating method for a chute. According to the heating method, fuel and mixed gas containing high-concentration oxygen or oxygen-rich air serving as accelerants are fed into the chute through a combustion spraying-in assembly to be combusted in a mixed mode, and the heat generated during mixed combustion is used for achieving heating and heat preservation of the chute. According to the method, the combustion spraying-in assembly used for feeding the fuel and the accelerants into the chute comprises a group of coaxial metal sleeve pipe spraying guns and/or metal single-pipe spraying guns arranged on a chute covering plate at intervals. The heating method for the chute can greatly reduce fuel consumption, improve the heating speed and uniformity of the chute, and greatly reduce combustion smoke amount and emission of pollutants.