Disclosed herein are a light emitting module, a display device and a method for manufacturing a light emitting module. The light emitting module includes a substrate provided with a concave reflecting structure, a first planarizing layer being arranged on the concave reflecting structure, a first anode being arranged on the first planarizing layer, a light emitting layer being arranged on the first anode, an opening of the concave reflecting structure facing the light emitting layer and a vertical distance from the bottom of the concave reflecting structure to the light emitting layer is a preset distance, a cathode being arranged on the light emitting layer. The method includes: forming a concave reflecting structure on a substrate, forming a first planarizing layer on the concave reflecting structure; forming a first anode on the first planarizing layer; forming a light emitting layer on the first anode; forming a cathode on the light emitting layer.