The invention discloses a production method of 2,2'-biimidazole and belongs to the field of organic chemical synthesis. 2,2'-biimidazole is prepared with the method as follows: 2-chlorocarbazole and bis(pinacolato) diboron are taken as raw materials, N-methyl pyrrolidone is taken as a solvent, sodium phosphate is taken as an acid-binding agent, all the materials have a Suzuki-Miyaura reaction, and 2,2'-biimidazole is synthesized. The reaction process is simple to operate, the yield is high, and 2,2'-biimidazole is suitable for industrial production. Synthesized 2,2'-biimidazole can be used for the field of organic optoelectronic materials, medicines and the like and is an important intermediate of carbazole photoelectric materials, medicines and pesticides.