The present invention relates to a method for manufacturing a catalyst for water electrolysis using a fluorine-doped support, comprising: preparing a support; doping fluorine onto the support; and forming a metal particle catalyst on a surface of the fluorine-doped support, and to a catalyst for water electrolysis manufactured thereby. The present invention uses a dry plasma process to omit the cleaning process and can easily form fluorine doping on the surface without causing structural collapse of the support material.