The transformation of the internal supervisor of the prosecutor's office is important, from a watchdog to a consultant and a catalyst to improve the performance and reputation of the prosecutor's office. This study analyzes the implementation of internal supervision of the prosecutor's office from watchdogs to consultants and catalysts, as well as the concept of internal supervision of the prosecutor's office to become consultants and catalysts in the future. The normative legal research method is carried out both by researching literature materials in the form of laws and regulations, literature, comparison, and case studies. 5 The concepts of IIA and 6 directives contained in the Circular Letter of the Deputy Attorney General for Supervision Number B-69/H/HJW/06/2019 should be regulated in the provisions of Article 23 of the Attorney General's Regulation Number PER-022/A/JA/03/2011 concerning the Implementation of Supervision of the Prosecutor's Office of the Republic of Indonesia and Article 524 of the Attorney General's Regulation Number PER-006/A/JA/07/2017 concerning the Organization and Work Procedures of the Attorney General's Office of the Republic of Indonesia. So that the provisions of Article 23 and Article 524 can be added clauses, namely "checking the compliance of the work unit with applicable regulations, checking financial accountability, assistance in planning programs and budgets, assistance in the preparation of performance reports and financial statements, providing consultation on the implementation of tasks in other fields, and the development of a clean and free environment, which has not been implemented in the internal supervision of the prosecutor's office". The results of the study show that the implementation of internal supervision of the prosecutor's office is still running with the embodiment of the watchdog paradigm. The internal supervision of the prosecutor's office, the consultant paradigm and catalyst refers to the concept of The Institute of Internal Audit (IIA).