The invention discloses a nitrogen-containing conjugated organic microporous polymer and belongs to the technical field of adsorption material preparation. Specifically, N<2>,N<4>,N<6>-tris(4-bromophenyl)-1,3,5-triazine-2,4,6-triamine and alkynylphenyl are utilized as comonomer; under catalysis of Pd(0), coupling is performed through Sonogashira; then high-temperature pyrolysis is performed in 700 to 820 DEG C to obtain the nitrogen-containing conjugated organic microporous polymer. The prepared nitrogen-containing conjugated organic microporous polymer disclosed by the invention has the characteristics of large specific surface area, narrow pore size distribution, high physical and chemical stability, low framework density and the like and shows excellent adsorption ability on carbon dioxide and iodine.