The invention provides a quantum dot light emitting device and a manufacturing method thereof and further a liquid crystal display device. The quantum dot light emitting device includes an anode and a cathode disposed opposite to and spaced from each other, and further a hole injection layer, a first hole transport layer, a first quantum dot light emitting layer, a charge generation layer, a second quantum dot light emitting layer, a first electron transport layer and an electron injection layer sequentially stacked between the anode and the cathode in that order. The charge generation layer includes sequentially-disposed a second electron transport layer, a carrier generation layer and a second hole transport layer in that order. The first quantum dot light emitting layer emits a first light, the second quantum dot light emitting layer emits a second light, and the second electron transport layer includes a water/alcohol-soluble polymer.