To provide a method for producing a planographic printing plate capable of preventing blanket stain and ink stain of a non-image region without lowering the ink receptivity and printing resistance of a silver image region with respect to a planographic printing plate using an aluminum sheet as a support and utilizing a silver complex salt diffusion transfer process.

In the method for producing a planographic printing plate having on an aluminum support at least a physical developing nucleus layer and a silver halide emulsion layer and utilizing a silver complex salt diffusion transfer process, a coating solution for the physical developing nucleus layer contains a polycarboxylic acid compound and the pH of the coating solution is adjusted to the range from the first dissociation stage to below the second dissociation stage of the polycarboxylic acid compound.