The invention discloses heat-aging-resistant aging hydrolysis-resistant polyamide/polypropylene alloy. The alloy is prepared from, by weight, 35wt%-100wt% of component A, 0-60wt% of component B selected from reinforcing filler and/or impact-resistant modifiers and 0-5wt% of component C selected from interface stabilizers. The total weight of the component A, the component B and the component C is 100wt%. By means of special limit of polyamide, polypropylene and compatilizers and use of the interface stabilizers used for stabilizing an interface between two pieces of incompatible resin, the polyamide/polypropylene alloy good in compatibility is obtained. The alloy has mechanical performance and thermal oxidizing aging resistance obviously better than those of common polypropylene or conventional polyamide polypropylene alloy. Besides, compared with common polyamide products, the polyamide/polypropylene alloy has a higher humid performance retention rate and higher hydrolysis resistance and thermal oxidizing aging resistance, and has remarkable economic benefits.