The purpose of this study is to analyze and find out the weaknesses in the regulation of the prosecutor's role in preventing and eradicating the crime of illegal investment and to reconstruct the regulation of the role of the prosecutor's office in preventing and eradicating illegal investment crimes in Indonesia based on the value of justice. This research is a non-doctrinal/socio-legal-research research with a descriptive study. The approach method in this research is Sociological Juridical Research using the constructivism paradigm. The findings show that there is no regulation on the role of the Prosecutor's Office in preventing and eradicating illegal investment crimes in Indonesia, this condition in preventing and eradicating illegal investment crimes in Indonesia is further worsened by the fact that there is inadequate infrastructure, less literate people, the culture of wanting to get rich quick. Based on this problem, the Reconstruction of the role of the prosecutor's office in the prevention and eradication of illegal investment crimes in Indonesia based on justice value is namely the need for a renewal of the regulation on the role of the prosecutor's office in preventing and eradicating illegal investment crimes, especially when linked to the Law of the Republic of Indonesia, investment between technical agencies and law enforcement officers for the prevention and eradication of criminal acts must also be controlled by the prosecutor's office.