The present disclosure provides a peep-proof film, the peep-proof film includes a light-transmitting film body, an electrophoretic liquid, a first electrode pattern and a second electrode pattern, the film body includes a light incident surface and a light exit surface which are opposite to each other, the first electrode pattern and the second electrode pattern are spaced in a thickness direction of the peep-proof film, the film body has a plurality of receiving cavities thereinside, the electrophoretic liquid is in the receiving cavities, the electrophoretic liquid is located between the first electrode pattern and the second electrode pattern and includes a dispersion medium and electrophoretic particles, and a refractive index of the dispersion medium is less than that of the film body. The present disclosure further provides a backlight source and a display device.