The invention relates to the field of environment purification and protection, in particular to a nanometer mercury material with lasting adsorption performance. Firstly, a composite aluminum oxide ceramic material is prepared by an organic foam dipping process to serve as a carrier; secondly, an activator is loaded on the surface of the carrier and in a micro pore of the carrier by an immersion method, wherein the coverage area of the activator is 85 percent or more, oxidization of chloride ions, sulfate radicals and nitrate ions in the activator to mercury is used to fix elemental mercury, silver and mercury are formed into amalgam to react and solubilize the elemental mercury, and the huge surface of porous ceramic is used to absorb valence state mercury; and finally, the mercury is reclaimed through a low-temperature thermal desorption method, and circular utilization of the carrier is realized. The material has performances of large surface area, strong permeability, high compression strength, impact resistance, high temperature resistance, environmental friendliness, high chemical stability and the like, the carrier can be circularly used, mercury recovery is simple and feasible, and secondary pollution is not caused. Furthermore, a material preparation process is simple and low in cost. The nanometer mercury material has very good application potential and good social and economic benefits.