Banking has always been one of the most important economic issues in any society, and today, due to the bank-oriented nature of our society's economy, the study of banking law issues has a special priority. One of the most challenging issues in this area is the phenomenon of bank entrepreneurship, which has attracted the attention of many media and experts. The purpose of this study is to legally study the process of separation of commercial banking and investment banking, as well as to examine the legal aspects of the phenomenon of bank entrepreneurship with a comparative approach and to examine the reasons for banks to move forward and to examine the Islamic position on this phenomenon. The author's research method in this research is descriptive-analytical, which has tried to study and analyze the subject by referring to books, articles, and interviews. Due to the economic conditions of society, bank entrepreneurship is an inescapable phenomenon and a way to preserve the existence of banks and their customers and also to prevent the spread of contagious risk to the country's banking system, which according to the definition of Islam is part of the nature of banking. Which must have a limit and not be unrestrained to cause harm to the country's economy.