The invention provides an LaSrMnCo/GdSrMnCo codoped bismuth ferrite superlattice film and a preparation method thereof. A Bi0.85La0.12Sr0.03Fe0.94Mn0.04Co0.02O3/Bi0.85Gd0.12Sr0.03Fe0.94Mn0.04Co0.02O3 superlattice film, namely the LaSrMnCo/GdSrMnCo codoped bismuth ferrite superlattice film, is prepared from bismuth ferrite films doped according to different elements, wherein the crystal structures of the bismuth ferrite films are trigonal structures and the space groups thereof are in a coexistent state of R3c: H and R3m: R. In the preparation method, a sol-gel process is adopted, and a spin coating and layer-by-layer annealing method is adopted; equipment requirements are low; the preparation method is suitable for preparing films on large surfaces and irregularly-shaped surfaces; chemical components are precise and controllable; nd the multi-ferrous performance of BiFeO3 films can be improved.