The invention relates to the technical field of catalytic conversion processing of a methanol fluidized bed and particularly relates to a catalytic conversion reaction method and a reactor. Accordingto the catalytic conversion reaction method provided by the invention, the catalytic conversion reaction process of reaction raw materials are completed in a lower-layer reactor (1) and an upper-layerreactor (2) of the catalytic conversion reactor in parallel, catalysts are separated from the reaction product gas of the lower-layer reactor and the reaction product gas of the upper-layer reactor after the reaction by respective independent cyclone separators arranged in a gas and solid separation area (3) or are separated by the shared cyclone separator, and then the gases flow out of the catalytic conversion reactor. By adoption of a parallel upper and lower double-layer overlapping arrangement mode, the processing quantity of the device can be greatly increased on the premise of not increasing the diameter of the catalytic conversion reactor; and when the lower-layer reactor and the upper-layer reactor are in gas and solid separation independent arrangement, the functions of two setsof catalytic conversion reactors can be completed and investment can be saved.