The present invention discloses composite material, method and device for preparing particle-energy multifunctional active water. The composite material contains the following components : Si, Re, Pt, Ge, Nb, Ni, Se and Mg. The composite material is prepared from the nanometer-sized particles of the above elements by magnetization, sintering and remagnetization. The composite material contacts and interacts with water in the device of the present invention to convert the water into the particle-energy multifunctional active water. The particle-energy multifunctional active water of the present invention is smaller than small molecule group water, and the specific gravity at normal temperature is 1.002-1.004g/cm 3 . The water is sterile water and its stability and activity are far better than those of small molecule group water. In addition, the water has a long shelf life. After a bottle water is stored for three years, its diameter, solvency, penetrability and activity do not have any changes, and it is still sterile water. The particle-energy multifunctional active water and can be used in fields such as food, health care, pharmaceuticals, biology, environment protection, disease control, agriculture, military industry, engineering, energy source and daily life.