The invention discloses a preparation method of a metallurgical exothermic agent for continuous casting end billets, belonging to the technical field of metallurgical continuous casting. In the present invention, aluminum powder, carbon powder, iron powder, silicon powder, FeO and CaO are configured according to weight percentage, and are stirred and mixed by a mixer; a binder is added therein, and then the mixer is continued to be stirred. Mix well; send the stirred raw materials to a molding machine to be pressed into agglomerates; finally, the agglomerates are dried and cooled naturally to obtain a metallurgical exothermic agent. In the present invention, the metallurgical exothermic agent prepared by the method is added to the crystallizer, and the carbon and aluminum in the metallurgical exothermic agent undergo an exothermic reaction with FeO, so as to provide higher heat for the tail billet when the continuous casting tail billet is solidified, and reduce the energy consumption. The solidification rate of the tail billet shell, and the metal Fe generated at the same time will feed the solidification shrinkage hole in the center of the tail billet, increase the density of the tail billet, improve the quality of the tail billet, and greatly improve the quality of the tail end of the billet, thereby reducing the The cutting amount of the tail end of the continuous casting billet.