The invention relates to the field of methanol hydrocarbon preparation, and discloses a method and a system for methanol hydrocarbon preparation. The method comprises the following steps of implementing in a system comprising a fluidized bed reactor, a heat exchange device and a gasifier, exchanging the heat of raw material containing liquid methanol and the heat of process gas from the heat exchange device in the gasifier, and gasifying the methanol; exchanging the heat of gasified raw material containing methanol and the heat of process gas from the heat exchange device in the gasifier, injecting the produced process gas containing hydrocarbon into the heat exchange device, and exchanging heat; removing one part of heat produced by reaction by a heat removing device in the reactor. The invention also discloses a system for implementing the method. The method has the advantages that by adopting a fluidized bed, the reaction matter is in full contact with a catalyst, the service life of the catalyst is uniform, the activity is improved, and the yield rate of hydrocarbon is improved; the heat transfer is uniform and rapid, the coefficient is large, the reaction heat can be timely removed, and the temperature in the reactor is stable and controllable; the output of steam is increased, the additional consumption of steam is not needed, and the electric consumption is decreased.