The invention relates to a proton exchange membrane fuel cell metal bipolar plate, which consists of a cathode monopolar plate and an anode monopolar plate made of sheet metal, wherein a flow passage of the monopolar plates consists of a flow field flow passage, a distribution flow passage and an inlet-outlet passage, and the proton exchange membrane fuel cell metal bipolar plate is characterized in that the distribution flow passage is a point-like flow passage, the point-like flow passage consists of unconnected lug bosses raised towards the front side of the monopolar plates, the back sides of the lug bosses are provided with steel pits, the steel pit on the back side of the lug boss on the cathode monopolar plate is staggered with the steel pit on the back side of the lug boss on the anode monopolar plate, and the front part and the back part of the steel pits are overlapped relatively to form continuous water flow distribution flow passages which are connected in series. The proton exchange membrane fuel cell metal bipolar plate has the advantages of thin thickness for the manufactured bipolar plate, strict separation of fluid, good fluid distribution, light weight, simple processing and low processing cost; besides, the bipolar plate has high effective utilization area and good fluid resistance distribution evenness, and can satisfy the needs of different battery heat exchanges.