The invention relates to a blank making method of a rolling process suitable for obtaining multiple hot-rolled plates at a time. The blank making method comprises the steps that multiple intermediateplates are prepared; an upper base plate and a lower base plate are prepared; the multiple intermediate plates are piled on the lower base plate, isolating agents are sprayed between the lower base plate and the intermediate plate on the lowest layer and between the intermediate plates, an isolating agent is sprayed to the intermediate plate on the uppermost layer, and the upper base plate is flatly arranged on the intermediate plate on the uppermost layer; four edges, namely, a pair of first edges and a pair of second edges, are prepared, the first edges and the second edges are placed between the upper base plate and the lower base plate, and a sleeve blank is made; and the sleeve blank is subjected to vacuum closing, and a blank used by the rolling process for obtaining the multiple hot-rolled plates at a time is made. By means of the blank making method, the multiple hot-rolled plates of the same specification can be obtained at a time by the made blank through the rolling process,after annealing, the process of acid pickling is omitted, and the yield and surface quality are greatly improved.