The invention discloses a method for activating a methane aromatizing catalyst in a circulating fluidization reaction system. According to the method, the catalyst is sequentially subjected to a circulating process of partial activation, partial surface de-carbonizing regeneration and partial activation with a fluidizing medium in the circulating fluidization reaction system, so that the activating treatment on the catalyst in the circulating fluidization reaction system is realized. The method has the advantages that a source of an active catalyst in the initial stage of a methane aromatizing circulating fluidization reaction is provided, the loss of the activity of the catalyst in the processes of storage, filling, conveying and the like when the catalyst is individually activated outside the fluidization reaction system is avoided, and the reaction performance of the methane aromatizing catalyst is explored to the greatest extent; meanwhile, the space of pilot test and industrial devices can be saved, and the equipment investment is reduced.