A composite metal cathode and a cell containing the cathode belong to chemical power supply technology field. The composite metal cathode comprises a current collector and a composite metal layer covering the current collector. The composite metal layer is formed by two or more metals having similar electrode potentials, and the plurality of metals contained in the cathode are simultaneously deposited/dissolved during charging and discharging. The cathode and the cell of the invention have advantages that when the metals of different crystal orientations are co-deposited, a dendrite phenomenoncaused by preferred growth of a certain crystal plane during single metal deposition can be alleviated, and the metals provide crystal nucleuses to each other so as to reduce nucleation overpotentialof a crystal, and promote the uniform deposition of the metals. The invention provides a new idea for the practical application of a high specific energy metal cell.