The present invention relates to a lithium metal powder, a preparing method thereof, and an electrode including the same, wherein the method for preparing the lithium metal powder includes: providing a lithium metal material and a ultrasonication solution; mixing the lithium metal material and the ultrasonication solution to form a mixed solution; and ultrasonically vibrating the mixed solution to form a lithium metal powder, wherein the lithium metal powder is covered by a protective layer, and the aforementioned protective layer includes a protective layer material, wherein the protective layer material includes a sulfide, fluoride, or nitride, or a combination thereof.