The invention provides a method for comprehensively recycling a waste Pd/Al2O3 catalyst. The method mainly comprises the steps of mixed fine grinding of waste catalyst raw materials and sodium hydroxide, roasting, reduction leaching and the like. The waste catalyst raw materials and the sodium hydroxide are added into a grinding machine at the same time to be finely ground, the effects of finely grinding the materials and uniformly mixing the materials and the sodium hydroxide are achieved, and meanwhile the chemical activity of the materials is enhanced. The mixed materials enable Al2O3 in the raw materials and the sodium hydroxide to react and be converted into Na2O.Al2O3 easily dissolved in water through roasting, and water is added for leaching to dissolve the Na2O.Al2O3 to effectively separate Pd and the Al2O3. To avoid the situation that the Pd is corroded by the sodium hydroxide, and consequently Pd dissolution losses are caused, reduction leaching is adopted in the leaching process, the final aluminum dissolution rate reaches up to 99% or above, the Pd concentration ratio exceeds 49 times, and the recycling rate is larger than 99.99%. The method has the beneficial effects of being short in procedure, easy and convenient to operate, short in leaching time and the like, and is suitable for large-scale application.