Method of warming up a fuel evaporator

b a p, a, a c, A method of warming up a fuel evaporator is disclosed. The fuel evaporator comprises: an evaporation chamber equipped with a first injection device for injecting raw fuel liquid onto a heat source and vaporizing the raw fuel liquid on the heat source; a catalyst combustor having a combustion catalyst and introducing catalytically burned combustion gas into the heat source; a second injection device for supplying fuel to the catalyst combustor; a combustion gas transferring device equipped with a fuel injection portion and a combustion catalyst and the fuel injection portion injecting fuel onto the combustion catalyst to generate a catalytically burned gas; a first temperature measurement device Tfor the catalyst combustor; and a second temperature measurement device Tfor the evaporation chamber. The warm-up method comprises the steps of: transferring the combustion gas with the combustion gas transferring device; stopping the combustion gas transferring device in accordance with a temperature of the catalyst combustor, and transferring fuel to the catalyst combustor with the second injection device; and injecting the raw fuel liquid from the first injection device in accordance with a temperature of the evaporation chamber so as to vaporize the raw fuel liquid within the evaporation chamber.