The invention discloses a method for producing pure silver from a waste silver catalyst whose carrier is alumina to co-produce metallic aluminum. In the method, the waste silver catalyst whose carrier is alumina is mixed with a flux, placed in an aluminum electrolytic cell for electrolysis, and respectively Obtain crude aluminum, crude silver and residual electrolyte, break the residual electrolyte and return to the electrolysis process; heat the crude aluminum above the melting point by melting method and stir, and precipitate as silver-aluminum intermetallic compound in solid state to form infusible residue, and the rest is liquid metal Aluminum, remove the residue and send it to the condensate process; use the condensate method to raise the temperature of the crude silver above the melting point, and then slowly cool it down to 960 ° C, the silver solidifies into a solid, and the aluminum floats on the surface of the solid silver in liquid form, then remove Liquid aluminum is returned to the smelting process; adopting this method to produce pure silver and metal aluminum, the recovery rates of silver and aluminum are greater than 98.0% and 95% respectively, and the purity of pure silver and aluminum products are respectively 98.5% and 98.0%, with high silver recovery rate , short process, green environmental protection, high resource utilization, low cost, and mature equipment.