TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preparation (claimed): The preparing method for the double active composite catalyst comprises (a) adding the solution containing borohydride ion (BH4-) into the solution containing soluble metal salt to form precipitate; the adopted soluble metal salt solution has metal ions as magnesium (Mg), aluminum (Al), zirconium (Zr), vanadium (V), chromium (Cr), cobalt (Co), nickel (Ni), iron (Fe), titanium (Ti), copper (Cu), zinc (Zn), neodymium (Nd), molybdenum (Mo), or silver (Ag); (b) filtering and washing the obtained precipitate in (a); heating processing in the inert gas environment like argon (Ar), nitrogen gas (N2), or under vacuum environment; obtaining the metal boride; (c) dipping the obtained metal boride in (b) into the soluble metal salt solution; the adopted soluble metal salt solution is platinum (Pt), ruthenium (Ru), palladium (Pd), Co, Ni, Fe, or Ag; and (d) drying the metal boride dipped with the soluble metal salt solution in (c); heating processing in the inert gas environment; letting the soluble metal salt attached to the metal boride be reduced to metal particles; obtaining the final product. Preferred Components: The chemical composition of the metal boride is MxB, where M is the metal elements comprising Mg, Al, Zr, V, Cr, Co, Ni, Fe, Ti, Cu, Zn, Nd, Mo, and/or Ag; x is greater than or equal to 1 and less than or equal to 4 and; the metal particles comprises Pt, Ru, Pd, Co, Ni, Fe and Ag or their alloys. The metal boride not only contains metal and B element, but also is bonded with O or H by chemical bonds or physical effects. Preferred Composition: The metal and boron (B) element together take up 35-90% of the total mass of the catalyst. Preferred Process: Preparing double active composite catalyst comprises (a) mixing B powder with Mg, Al, Zr, V, Cr, Co, Ni, Fe, Ti, Cu, Zn, Nd, Mo, or Ag; forming metal boride by mechanical alloying; (b) dipping the obtained metal boride in (a) into soluble metal salt solution; the adopted soluble metal salt solution has soluble salt solution of metals such as Pt, Ru, Pd, Co, Ni, Fe, or Ag; and (c) drying the metal boride dipped with soluble metal salt solution in (b); heating processing in the inert gas environment; letting the soluble metal salt attached to the metal boride be reduced to metal particles; obtaining the final product. Preparing double active composite catalyst further comprises (a) mixing the boron powder with Mg, Al, Zr, V, Cr, Co, Ni, Fe, Ti, Cu, Zn, Nd, Mo, or Ag; melting metal boride by means of arc discharging in the inert gas environment or under vacuum environment; (b) dipping the obtained metal boride in (a) into the soluble metal salt solution; the adopted soluble metal salt solution has soluble salt solution of metals such as Pt, Ru, Pd, Co, Ni, Fe, or Ag; and (c) drying the metal boride dipped with the soluble metal salt solution in (b); heating processing in the inert gas environment; letting the soluble metal salt attached to the metal boride be reduced to metal particles; obtaining the final product.