The invention relates to a polymer film. The polymer film comprises a base layer (1) and a surface layer (2), a heat insulation layer (3) and a radar absorption layer (4) are sequentially arranged between the base layer (1) and the surface layer (2), the heat insulation layer (3) is arranged on the base layer (1), the heat insulation layer (3) is a polyurethane foam plastic, the radar absorption layer (4) is arranged between the surface layer (2) and the heat insulation layer (3), and the radar absorption layer (4) is ferrite. The stealthy polymer film is characterized in that the heat insulation layer and the radar absorption layer are sequentially arranged between the base layer and the surface layer, the heat insulation layer is arranged on the base layer, the heat insulation layer is the polyurethane foam plastic, the radar absorption layer is arranged between the surface layer and the heat insulation layer, and the radar absorption layer is ferrite. The polyurethane foam plastic has a good heat insulation performance and can effectively isolate heat on engines and exhaust pipes of military vehicles from being detected by photoconductors, and the ferrite can effectively absorb radar electromagnetic wave energy projected on the surface of the ferrite, so the polymer film can effectively keep away from radars and the photoconductors to realize the stealthy effect.