Method for leaching platinum metals from spent automobile exhaust catalyst

The invention provides a method for leaching platinum metals from a spent automobile exhaust catalyst, which comprises the following steps: preliminarily pulverizing the spent automobile exhaust catalyst, and carrying out fine grinding; adding a flux and an oxidizer A, evenly mixing, and calcining at 600-700 DEG C; and carrying out normal-temperature water dissolution agitation leaching, carrying out solid-liquid separation, washing the filter residue three times, adding hydrochloric acid and an oxidizer oxidizer B into the filter residue, carrying out acid pickling at 70-90 DEG C to dissolve residual platinum, filtering, washing, discarding the filter residue, and collecting the filtrate and washing solution, thereby obtaining a solution containing rich platinum metals Pt, Pd and Rh. The invention is simple to operate, has simple procedure, integrally simplifies the leaching process, solves the problems in the traditional wet-process leaching, and can treat the Pt-Pd-Rh ternary catalyst in a better and more