[1][2] Buchmann sat his Abitur at the Bundesgymnasium Carnerigasse Graz in 1981, followed by military service.

Christian Buchmann started his career in 1982 as a secretary of the Junge ÖVP of Styria.

Between 1988 and 1993 he worked as a managing director for trade at the chamber of economics Styria.

In 2003, Buchmann became city councillor for economics, science and culture in Graz, and between 2005 and 2017 he was Member of the Styrian Government in charge of economy, innovation and finances.

Between 1987 and 1992 Buchmann was chairman of the Junge ÖVP Graz and from 1990 to 1993 financial consultant.