Biological membrane-wrapped multi-mode tumor contrast agent as well as preparation method and application thereof

The invention provides a biological membrane-wrapped multi-mode tumor contrast agent as well as a preparation method and application thereof. The biological membrane-wrapped multi-mode tumor contrastagent comprises a biological membrane, a ferritin nanometer cage (M-HFn) of superparamagnetic ferroferric oxide and a fluorescent dye, wherein the ferritin nanometer cage (M-HFn) of the superparamagnetic ferroferric oxide and the fluorescent dye are wrapped with the biological membrane and are connected with each other to form a fluorescent dye-M-HFn compound, a bionic nanometer biological membrane vector delivery system in vivo is constructed, in vivo long circulation can be realized, targeting to a tumor is strengthened, non-specific accumulation is reduced, damages on normal tissues are reduced, and the contrast effect is strengthened at the same time. The invention also provides a preparation method of the biological membrane-wrapped multi-mode tumor contrast agent, and the preparationmethod has important appl