A light uniformization structure including a first material layer having a plurality of microstructures in a surface thereof, a second material layer having a plurality of microstructures in a surface thereof, and a spacer layer located between the first material layer and the second material layer. The refractive index of the spacer layer is smaller than a refractive index of the first material layer and a refractive index of the second material layer. A light emitting module including the light uniformization structure is also disclosed.