She graduated from Yerevan State University with a degree from the Department of Law with honors in 1994. Continuing on with post-graduate studies at the same university, she was awarded a Ph.D. in law in 1997, her thesis being "Legal State: General Description, Principles of Organizing and Directions of Activity".
From 1994 to 1999, Petrosyan held various positions in the office of the President of Armenia, before being appointed Deputy Minister of Justice, a post she held until 2002. In 2002, she was appointed to the first of two terms as a deputy Chairperson of the Council of Civil Service, the second beginning in 2007. On May 12, 2007, she was elected to the National Assembly as a member of the Prosperous Armenia party. One of the leaders of Prosperous Armenia, she was elected Vice President of the National Assembly on November 12. As of March 2010, this is the highest Armenian government position ever held by a woman. On October 7, 2010, she gave up the office to another member of her party at the instigation of Prosperous Armenia. On December 8, President Serzh Sargsyan appointed Petrosyan to the Constitutional Court of Armenia.
- "Arevik Petrosyan". Constitutional Court of Armenia.
- "Arevik Petrosyan". National Assembly of Armenia.
- Lansford, Tom (2012). Political Handbook of the World 2012. SAGE. p. 70. ISBN 9781608719952.
- Gayane Abrahamyan (March 26, 2010). "Long Way to Go for Armenia's Women". Institute for War and Peace Reporting.
- "Arevik Petrosyan appointed member of Armenian Court of Cassation". News.am. December 8, 2010.
- "Why did Arevik Petrosyan resign?". slaq.am.
- "Arevik Petrosyan surprised at her possible appointment as RA CC member". panarmenian.net. October 4, 2010.