The invention belongs to the technical field of activated carbon based material adsorption catalysts and in particular relates to an unshaped activated coke (CDG) adsorption catalyst. The catalyst is characterized by adopting brown coal and/or non-caking coal and/or weakly caking coal as the raw material, obtaining crystallitic graphite coke through dry distillation of the raw material at low temperature, recycling the coal tar and the synthesis gases in the crystallitic graphite coke and carbonizing and activating the crystallitic graphite coke to prepare the catalyst. The catalyst is the carbon-based adsorbing material with developed pore structure, good chemical stability and mechanical strength, can effectively remove such harmful substances in the high concentration gases as oxides of sulfur and nitrogen, hydrogen sulfide, organic gases and contained granules and suspended matters, and has low cost, good adsorbability, high yield, simple process, good adsorption effect and strong practicability.