NOVELTY - A hydrogen preparing has a fuel chamber (2) for storing a reaction solution, a reaction chamber (4) for laying a catalyst and a waste material chamber (9). A reaction solution inlet provided on the fuel chamber. A waste material liquor outlet (1) is provided on the waste material chamber. The fuel chamber is connected with the reaction chamber through a controlling valve (3), and is connected with upper end of waste material chamber through a connection pipe and a one-way valve. A gas liquor separation chamber is provided on upper portion of the waste material chamber.    USE - System is used for preparing hydrogen using boron hydride.    ADVANTAGE - The system enables preparation of hydrogen efficiently and economically.    DETAILED DESCRIPTION - A hydrogen preparing has a fuel chamber for storing a reaction solution, a reaction chamber for laying a catalyst and a waste material chamber. A reaction solution inlet provided on the fuel chamber. A waste material liquor outlet is provided on the waste material chamber. The fuel chamber is connected with the reaction chamber through a controlling valve, and is connected with upper end of waste material chamber through a connection pipe and a one-way valve. A gas liquor separation chamber is provided on upper portion of the waste material chamber. A hydrogen outlet is provided on the gas liquor separation chamber. An alkali removal device is provided between the gas liquor separation chamber and hydrogen outlet. An adsorption substance or an organic acid is provided in alkali removal device. The adsorption substance is absorbent cotton, molecular sieve, active carbon, allochroic silica gel, ferric chloride and/or phosphorus pentoxide. The organic acid is citric acid, acetic acid, maleic acid, succinic acid and/or malic acid. The waste material chamber contains elastic substance such as rubber or elastic metallic sheet, preferably rubber. A foaming nickel is provided in the gas liquor separation chamber. The reaction solution is alkaline solution of boron hydride. The boron hydride contains boron hydride salt (M(BH4)n), tri-borohydride salt (MB3H8), deca-hydrogen deca-borate (M2B10H10), trideca-hydrogen deca-borate (MB10H13), dodeca-hydrogen dodeca-borate (MB12H12) and/or octadeca-hydrogen cosa-borate (M2B20H18), where M is alkaline metal, alkaline earth metal or anion of aluminum and n is not defined. The alkaline solution is sodium hydroxide solution, potassium hydroxide solution, barium hydroxide solution and/or lithium hydroxide solution.    DESCRIPTION OF DRAWING(S) - The drawing shows the sectional view of the system for preparing hydrogen.    Waste material liquor outlet (1)    Fuel chamber (2)    Controlling valve (3)    Reaction chamber (4)    Waste material chamber (9)