The invention belongs to the technical field of application of hydrates, relates to a fluidized bed furnace system for capturing CO2 based on a hydrate method. The fluidized bed furnace system comprise reactors, a computer acquisition system, a gas inlet system, an exhaust system and a feeding back system; after pressurized by a gas booster pump, a mixed gas is input to the reactors, the reactors are filled with a THF/SDS solution and silica gel particles, and working parameters during reaction are acquired and analyzed in real time by the computer data acquisition system. According to the invention, a method for capturing CO2 based on the hydrate method is combined with a fluidized bed furnace, so that a technology for capturing CO2 based on the hydrate method can realize industrialization; meanwhile, the THF/SDS mixed solution is added into feeding openings, so that shortcomings of low speed and long cycle of hydrate formation can be overcome by the dry silica gel particles. The reactors are designed of a two-stage structure, the utilization ratio of materials can be improved, and a problem of blockage of porous medium pores, which is caused by the hydrate formation, can be solved; the feeding back system is arranged at the lower part of the device (namely the system) to recycle waste materials, so that reuse is facilitated, and the economical efficiency is improved.