Disclosed is a heterogeneous fuel storage tank. According to an embodiment of the present invention, the heterogeneous fuel storage tank includes: a first storage space which stores first liquefied gas; and a second storage space which stores second liquefied gas. The second liquefied gas has a liquefaction point higher than that of the first liquefied gas. The first and second storage spaces are partitioned by an inner partition. The heterogeneous fuel storage tank can re-liquefy evaporated gas of the second liquefied gas effectively.
