To provide a method for producing a waterless planographic printing original plate free of unevenness in plate performance and ensuring stable adhesion between a heat sensitive layer and a silicone rubber layer and high aging stability of a coating liquid.

The method for producing an original plate of a planographic printing plate not requiring dampening water obtained by laminating at least a heat sensitive layer and a silicone rubber layer in this order on a support includes (1) a step for dissolving a diorganopolysiloxane and a curing catalyst in a solvent, (2) a step for dissolving a crosslinking agent in a solvent, (3) a step for mixing a solution prepared in the step (1) with a solution prepared in the step (2), and (4) a step for coating the top of a heat sensitive layer with a liquid mixture prepared in the step (3) to form a silicone rubber layer.