The present application relates to a negative electrode plate and a lithium metal battery. The lithium metal battery includes a steel can; a core disposed inside the steel can, the core is formed by winding a positive electrode plate, a separator, and a negative electrode plate, the negative electrode plate is made of lithium metal, and a metal reinforcement structure is embedded in the negative electrode plate; a negative electrode tab, a first end of the negative electrode tab is connected to the negative electrode plate, and a second end of the negative electrode tab is welded to an inner wall of the steel can; a positive electrode tab, a first end of the positive electrode tab is connected to the positive electrode plate; a cap, a second end of the positive electrode tab is welded to the cap; an insulation assembly arranged at both ends of the core.