A composite material, method and device for preparing particle-energy multifunctional active water. The composite material contains Si, Re, Pt, Ge, Nb, Ni, Se and Mg, and is prepared from nanometer-sized particles of these elements by magnetization, sintering and remagnetization. The composite material contacts and interacts with water to convert the water into the particle-energy multifunctional active water. The particle-energy multifunctional active water is smaller than small molecule group water, with specific gravity at normal temperature of 1.002-1.004 g/cm3. The water is sterile, with stability and activity better than small molecule group water. The water has a long shelf life. After bottled water is stored for three years, its diameter, solvency, penetrability and activity do not change, and it is still sterile. The particle-energy multifunctional active water 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.