Water contaminated by heavy metals remains a serious environmental and public problem. Diverse technologies have been used to reduce the contents of heavy metals in water, but recovery of heavy metals present in wastewaters in relatively low concentrations (i.e. less than 10 mmol/L) is rather difficult. The objective of the present study was to synthesize a composite nanometer material with high efficiency adsorption capacity to remove heavy metals with low concentration in water. [Methods] The composite nanometer material was principally composed of AlOOH nanoparticles with fiberglass as the carrier and active carbon felt as the underlay. The AlOOH nanoparticles were the products of reaction of Al nano-powders, which was prepared by wire explosion method, with de-ionized water. The structure and morphology of composite nanometer material and nanoparticles were characterized by X-ray diffraction (XRD), scanning electron microscope (SEM), transmission electron microscope (TEM), and nitrogen adsorption technique. The high efficiency adsorption property was investigated by repeated water-purifying experiments. [Result] The nanoparticles were fibroid, its BET surface area was very large, and the maximal ratio of removal can achieve 99.99%. [Conclusions] The composite nanometer material has shown the great potential to remove heavy metal with low concentration in water.