The invention discloses a precious metal alkaline turbid solution. The problem that catalyzing boards provided with thin precious metal films cannot be prepared in a batch mode and have high comprehensive cost and low composite efficiency is solved. The precious metal alkaline turbid solution is mainly prepared by evenly mixing materials and 1L of pure water, wherein the materials include 1.5-3.5mol of sodium hydroxide,1.5-3.5mol of potassium hydroxide, 0.5-1.5mol of ammonium hydroxide, 0.5-1.5mol of absolute ethyl alcohol, 4-6mol of rhodium chloride, 4-6mol of iridium chloride, 4-6mol of copper chloride and 4-6mol of sodium chloroplatinite. By utilizing the precious metal alkaline turbid solution and the catalyzing board preparation method of the precious metal alkaline turbid solution, the catalyzing boards with thin precious metal films can be manufactured in the batch mode, the comprehensive cost of the catalyzing boards is effectively reduced, the catalyzing efficiency of the catalyzing boards is improved, and the composite efficiency of the catalyzing boards reaches to 98%.