The invention discloses a method for enriching platinum group metals in waste automobile exhaust catalysts by pyro-reduction smelting bismuth, which belongs to the field of rare metal smelting. The process steps include batching, primary smelting and capturing and secondary smelting and capturing. In the present invention, metal bismuth is used as a trapping agent to smelt and trap platinum, palladium and rhodium in waste automobile exhaust catalysts, and the specific process is optimized to design the platinum, palladium and rhodium in waste automobile exhaust catalysts. Metals are captured more effectively, which improves the recovery rate of platinum group metals and metal bismuth, and also solves the difficulties in the separation of base metals in the traditional copper, lead, iron and other capture methods, the high toxicity of the collector, and the smelting temperature. Higher disadvantages eliminate the defect of low recovery rate caused by catalyst carrier wrapping platinum group metals, reduce the difficulty of separation and recovery of platinum group metals in catalysts, and its process flow is short, enrichment effect is good, environmental protection, non-toxic, low cost, and wide application Good prospects.