The invention discloses a method for prolonging service life of a reformate molecular sieve refined catalyst. The method is that activated clay and molecular sieve refined catalyst are adopted to compositely fill, and comprises the following steps: step 1, performing primary refining by making the reformate pass through the activated clay, so as to remove most of colloid which is easy to cause carbon deposition and a part of olefin; and step 2, further removing colloid and residual olefin from the reformate refined by the activated clay through the molecular sieve refined catalyst. By virtue of the method, the service life of the molecular sieve refined catalyst can be greatly prolonged, the regeneration and replacement efficiency of the catalyst is reduced, the safety and running efficiency of the facility are enhanced, and the overall economic efficiency is improved.