Abstract: A light mixing LED and manufacturing method thereof, wherein the manufacturing method comprises the steps of forming, on an insulation substrate, a first quantum well active layer, a tunnelable barrier layer, a second quantum well active layer, a first electrode, a second electrode. Under the condition that the wavelengths of the light from the first and second quantum well active layers are predetermined, as the thickness of the tunnelable barrier is changed, the tunneling probability of the conductive carrier through the tunnelable barrier can be changed and consequently lead to the numbers of the conductive carriers flowing into and taking part in the electro-photo energy conversion in the first active layer and in the second active layer are different. Therefore a mixed light of specific chromaticity can be obtained by modulating the width of the tunnelable barrier.