The invention relates to a method for preparing a reinforcing anti-aging co-crosslinked elastomer, which is characterized by comprising the following steps of: putting 100 weight parts of non-polar rubber resin, 5 to 50 weight parts of unsaturated carboxylic acid material, 0.1 to 3 weight parts of initiator, 1 to 60 weight parts of rare earth material, 1 to 25 weight parts of compatilizer, 1 to 100 weight parts of reinforcing filler and 0.1 to 5 weight parts of anti-aging agent into processing equipment at one time, and uniformly mixing at the temperature of between 24 and 70 DEG C to obtain composite glue; and quickly feeding the composite glue into 150 to 210 DEG C reaction equipment, performing vulcanization reaction in a covalent coordination co-crosslinking mode, discharging, and cooling to obtain a covalent coordination co-crosslinked elastomer. The reinforcing anti-aging covalent coordination co-crosslinked elastomer prepared by the method has high mechanical property and meetsthe requirement of practical application better.