PURPOSE: A fluidized bed-water gas membrane reactor and a method for separating carbon dioxide using the same are provided to increase the concentration of the carbon dioxide in mixed gas by selectively separating hydrogen from the mixed gas. CONSTITUTION: A fluidized bed-water gas membrane reactor and a method for separating carbon dioxide using the same includes a reactor, a synthetic gas supplying pipe(30), a steam supplying pipe(40), a hydrogen draining pipe(50), and a mixed gas draining pipe(60). The reactor includes a dispersing plate(21) and a membrane(22). The reactor divides an internal space into a lower layer introducing part(23), an intermediate layer reacting part(24), and an upper layer separating part(25). Fluidizing gas is supplied through the lower layer introducing part and a catalyst fluidizing process is implemented. The hydrogen draining pipe is in connection with the upper side of the upper layer separating part and drains separated hydrogen. The mixed gas draining pipe is in connection with the upper side of the intermediate layer reacting part and drains carbon dioxide with high concentration.
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