The invention discloses a quantum-dot LED, and belongs to the technical field of an LED light source. The quantum-dot LED comprises a support, an LED chip, a quantum-dot layer and a spacing layer, wherein a flat plate is arranged at the bottom of the support, the periphery of the support extend upwards to form an intermediate cavity, the LED chip is fixedly arranged at the bottom of the support, the center of the LED chip is arranged on a central shaft of the support, the quantum-dot layer comprises a red quantum-dot material and a green quantum-dot material, the spacing layer is arranged between the quantum-dot layer and the LED chip and is used for preventing the quantum-dot materials from being in direct contact with the LED chip so that the LED chip is far away from the quantum-dot layer at a certain distance, the maximum blue-light power received by the quantum-dot material above the LED chip is reduced to a limit range of the blue-light power which can be borne by the LED chip, the problem of quantum dot failure of a part right above the LED chip is prevented, and the lifetime of the quantum-dot LED is prolonged.