A lithium metal electrode and its related lithium metal battery is disclosed in the present invention. The lithium metal electrode comprises a current collector, a lithium metal layer, an insulation frame, a porous electrical insulation layer and an ionic diffusion layer. The current collector has at least a well. The lithium metal layer is disposed on the bottom surface of the well. The insulation frame is disposed alone the opening of the well. The insulation frame extends radially outward the opening to cover a top surface of the current collector partially and extends vertically toward the inner sidewall of the well. The lithium dendrites will mostly plate in the well and will not plate upwards due to the inhibition layer. Hence, the lithium dendrites will not penetrate through the electrical insulator so that the safety of the lithium metal battery can be improved greatly.