A recombinant vector according to an embodiment of the present invention may be used for producing a reconstituted cytochrome P450 oxygenase-reductase fusion protein. Oxygenase and reductase may be independently expressed in a host cell into which the recombinant vector is introduced, and then may be fused with a split intein so that it is possible to increase the heme content contained in the active site of the oxygenase and improve enzyme activity and stability.