Metal bipolar plate for proton exchange membrane fuel cell and fuel cell composed of metal bipolar plate

The utility model provides a metal bipolar plate for a proton exchange membrane fuel cell and a fuel cell composed of the metal bipolar plate. The metal bipolar plate for the proton exchange membrane fuel cell comprises parallel runners which are made of metal skin by using an embossing method and are used for distributing a reaction gas, so that single polar plates are formed; the parallel runners pass through one end to another end of each polar plate; a titanium material or titanium alloy skin and the single polar plates with the runners are prepared into a metal bipolar plate by using a spot welding method; or the two single polar plates are prepared into a metal bipolar plate by using the spot welding method; a TiC layer is prepared on the surface of the metal bipolar plate. As the relatively dense TiC layer is formed on the surface of the metal bipolar plate, and chemical bonds are formed by the TiC layer together with a titanium base body of the metal bipolar plate, the binding force is high, and the s