The invention discloses a preparation method of metal bipolar plate surface coating of proton exchange membrane fuel cell, wherein the bipolar plate is made of low-cost iron series, nickel series metallic materials; stannic oxide (SnO2) or tin indium oxide (ITO) or tin cadmium oxide (CTO) doped with fluorine (F) or stibium (Sb) is used, and metallic oxide doped with little tungsten, zirconium, cerium, titanium, yttrium, silver, vanadium, bismuth, neodymium is used as coating. The invention discloses a technology for preparing the coating with spray pyrolysis and sputtering methods, comprising coating solution preparation, metal bipolar plate preparation, and spray painting, pyrolysis conductive coating preparation and post treatment. The invention solves the problems of proton exchange membrane fuel cell since the metal bipolar plate has too high cost, thereby having the advantages of high corrosion resistance, low contact resistance, electric conduction, low cost, and the like.