Provided is a light-emitting diode light bar. The light-emitting diode light bar comprises a substrate and a light-emitting diode grain arranged on the substrate, wherein the substrate is provided with a first surface and a second surface, a first electrode and a second electrode are arranged on the first surface, the light-emitting diode grain is arranged on the first surface of the substrate, and is electrically connected with the first electrode and the second electrode, a packaging material layer covers the light-emitting diode grain, and a protective layer covers the first electrode and the second electrode. The light-emitting diode light bar further comprises a first cover body and a second cover body, wherein the first cover body and the second cover body cover the first surface and the second surface of the substrate respectively to form a light bar structure, and the phenomenon that electrical conductivity of the first electrode and the second electrode is influenced due to the fact that water vapor enters a circuit structure of the light-emitting diode light bar can be prevented through the protective layer.