Micro LED display device and manufacturing method thereof

The invention discloses a Micro LED display device which comprises a Micro LED micro display wafer, and LED units are arranged on the Micro LED micro display wafer in an array mode. Each LED unit comprises a pixel light-emitting unit, a quantum dot light conversion layer, a protective layer and a reflective retaining wall; the pixel light emitting unit and the quantum dot light conversion layer are arranged on the Micro LED micro display wafer; the pixel light-emitting unit is packaged in the quantum dot light conversion layer; the protection layer is arranged outside the quantum dot light conversion layer in a wrapping manner; and the reflective retaining wall is circumferentially arranged outside the protective layer. And a reflective retaining wall is arranged between the quantum dot light conversion layers, so that the problems of optical crosstalk and side wall light emission are solved. A transparent barrier layer is arranged on the top of the quantum dot light conversion layer, so that quantum dot mate