The invention discloses a large-scale adsorbing material ZIF-8 synthesizing and forming methods, and belongs to the technical field of adsorbing materials. The method comprises the steps of: pouring 70-75ml of dimethyl formamide (DMF) into a polytetrafluoroethylene liner with the volume of 100ml, and adding Zn(NO3)2.6H2O and 2-methylimidazole according to a molar ratio of 1:(2-4) to be fully dissolved; crystallizing under self-generated pressure; heating from a room temperature to a preset crystallization temperature through programs, and then preserving a constant temperature for a plurality of hours; cooling, filtering in vacuum and washing; weighing and putting ZIF-8 powder into a mortar, and adding an adhesion agent to be completely ground together; then adding a peptizing agent, and completely grinding the peptizing agent in the mortar until wet fine powder is formed; and tabletting the obtained wet fine powder through a tabletting machine so as to obtain a platy ZIF-8 mateiral. The ZIF-8 synthesized by the method has high crystallinity and good adsorption property.