Abstract: An optical film and a light emitting module using the same are disclosed. The light emitting module includes a light emitting assembly and an optical film. The light emitting assembly includes a substrate and a plurality of light emitting units disposed on the substrate. The optical film is disposed above the light emitting units, and includes a base layer and a first optical structure. The first optical structure is disposed on the base layer and includes a first high refractive index layer and a first low refractive index layer. The first high refractive index layer is located between the light emitting assembly and the first low refractive index layer. The first inclined surfaces are formed on an interface between the first high refractive index layer and the first low refractive index layer. Each first inclined surface is inclined relative to a thickness direction of the base layer.