The invention belongs to the field of ferro-electromagnetism and particularly discloses a bismuth ferrite organic-inorganic composite material and a preparation method thereof. The composite material uses nano-scale bismuth ferrite as a core, and the kernel surface of bismuth ferrite is bonded with PVDF. Firstly, nano-scale bismuth ferrite powder is prepared; then, the bismuth ferrite and vinyl fluoride are compounded through photocatalysis. Compared with the prior art, the bismuth ferrite organic-inorganic composite material can overcome the defect that the bismuth ferrite film dispersion degree is not high, the bismuth ferrite powder is saved, and the efficiency is improved. The preparation method includes simple steps and is easy to operate, the preparation conditions are mild and easy to control, and the efficiency is high.