A protective film includes an adhesive layer and a base film layer that are stacked. The adhesive layer is configured to adhere to a foldable display. The base film layer includes one or more layers of high-modulus base film and one or more layers of low-modulus base film. An elastic modulus of the high-modulus base film is greater than an elastic modulus of the low-modulus base film. The high-modulus base film and the low-modulus base film are alternately stacked. A surface layer in the base film layer and non-adjacent to the adhesive layer is the high-modulus base film. The protective film is configured to be firmly attached to the foldable display, resists rebounding and warping when the display is bent, and protects the foldable display.