DKTA-1 arsenic removal catalyst is composed of copper oxide alumina, which can be used in room temperature or low temperature of a new arsenic removal agent. It can remove the hydrogen arsenide, alkyl arsenide and phosphide in naphtha and liquid hydrocarbon, and remove the reactive sulfide (hydrogen sulfide, mercaptan). The dearsenization agent has strong capacity and high compressive strength, and can be used in the dearsenization process of raw materials in polypropylene unit, polyethylene unit and reforming unit.