The invention discloses a metallic bipolar plate of a proton exchange membrane fuel cell and a single cell and an electric stack formed by the same. The metallic bipolar plate is a non-planar arc plate with certain curvature, and is formed by relatively combining a cathode monopolar plate and an anode monopolar plate which are made of metal sheets; cathode and anode cavities, cooling medium cavities, flow field area grooves and lug bosses of the two plates have mutual corresponding convex-concave shapes and form a fuel gas passage, an oxidant gas passage and a cooling medium passage respectively; and a membrane electrode and single bipolar plate can be combined into single fuel cell, and a plurality of single cells can be superposed and connected to form the electric stack. Compared with a common metallic bipolar plate, the bipolar plate has better mechanical property, is not easy to deform or dislocated after assembly, and has high stability; and because the contact between the bipolar plate and a diffusion layer of the membrane electrode is good, the internal resistance is low, the energy consumption is low, and the formed electric stack can provide higher output voltage and higher output power.