The invention relates to the method of forming a platinum-based catalytic coating on electrodes for using in electrochemical devices such as fuel cells or electrolysis cells. According to the invention, to produce a platinum-based catalyst, the carrier is preliminary cleaned by ion etching and the catalytic coating is applied onto the cleaned surface from at least one target based on platinum in vacuum in the primary gas plasma with addition of reactive gas, sputtering being done at the power density on the magnetron sputtered target within (0.004-0.17)*105 W/m2 and the ratio of concentrations of the primary and reaction gas of 75-99%. Technical result: increased specific catalytic activity of the electrode's catalytic coating for electrochemical devices (fuel cells and electrolysis cells).