The invention provides a method for manufacturing a highly dispersed carbon supported metal catalyst, including charging a carbon support and a dispersing agent in water. The carbon support is evenly dispersed in water with an average diameter of 10 nm to 2000 nm and a specific surface area of 50 m2/g to 1500 m2/g. A metal salt of Pd, Pt, or combinations thereof is formed on the carbon support surface and then reduced to a valance state less than (IV).