The invention provides a light turning film, which comprises a transparent base material layer and a prism layer arranged on the transparent base material layer, wherein a prism structure is arranged on the surface of one side, away from the transparent base material layer, of the prism layer. The light turning film also comprises a filling layer arranged on the surface of one side, away from the transparent base material layer, of the prism layer. The refractive index of the filling layer is smaller than that of the prism layer, and the refractive index difference between the prism layer and the filling layer is no less than 0.05. According to a snell law, as for light passing through the light turning film and coming out from the outer surface of the filling layer, an interface reflection angle between the surface of the filling layer and the air is no less than 1 DEG, and thus, incident light incident indoors can be deflected at a large angle when passing through the light turning film, the incident light is upwardly reflected to the indoor top surface and/or downwardly deflected to the indoor bottom surface and then reflected to the indoor through the top surface and the bottom surface, and thus, the whole indoor is lightened, and the utilization rate of the incident light passing through the light turning film can be effectively improved.