The invention relates to a common chemical method which is performed in the presence of a fluid and solid particles, and a device used in the method. The continuous reaction-generation catalytic conversion system comprises a pretreater, a riser reactor, a settler and a regenerator which are sequentially connected with one another end to end by pipelines, wherein a riser lead-out hole is formed in the upper part inside the settler; a settler lead-out hole is connected with a regenerator lead-in hole; a regenerator lead-out hole is connected with a pretreater lead-in hole; a pretreater lead-out hole is connected with a riser lead-in hole; a raw material lead-in hole is formed in the riser reactor and the height of the raw material lead-in hole is larger than that of the riser lead-in hole. The method comprises the steps of adding a fresh catalyst into the pretreater, introducing raw materials for reaction into the raw material lead-in hole of the riser reactor, and introducing regenerative gas into the regenerator. The riser reactor is creatively combined with the regenerator of a multistage fluidized bed for catalytic conversion reaction, the problem of rapid inactivation of a catalyst in the catalytic conversion reaction is effectively solved and the continuous reaction and regeneration are achieved.