The invention belongs to the technical field of environmental protection, and particularly relates to a mercury collecting apparatus. According to the present invention, the provided mercury absorption material creatively adopts active carbon fibers loading sulfate and silver, such that the mercury absorption material can selectively adsorb mercury vapor in gas, the adsorption process is clean andenvironmentally friendly, does not generate waste gas, wastewater and other secondary pollutants, and the regeneration process of the absorption material is simple, and does not generate secondary pollution; according to the provided mercury collecting apparatus, different absorption layer can be designed according to actual engineering requirements, wherein the absorption inner cavity wrapped with the mercury absorption material can be selected, the absorption plates arranged in a parallel layer by layer can be selected, and the modularization of the apparatus can be achieved through the twodesigns, such that the absorption layers can be conveniently replaced, and the advantages of high treatment efficiency and complete absorption can be respectively achieved; and the selective absorption of mercury can be further promoted by arranging the gas-permeable hydrophobic layer on the absorption assembly, and by combining with the preferred regenerated gas reaction temperature, the mercuryconcentration in the treated regenerated gas can be as low as 1 [mu]g/m<3>.