After his primary and secondary schooling in Brazzaville, Milongo earned a Master's Degree in Law at the University of Nancy, after which he studied at the École Nationale d'Administration (ÉNA) in Paris, graduating in 1964. That year is also known as the "Blaise Pascal generation" at ÉNA.
Milongo's educational journey began with primary and secondary schooling in Brazzaville, leading to a Master's Degree in Law from the University of Nancy. He then proceeded to study at the École Nationale d'Administration (ÉNA) in Paris, graduating in 1964, an year that is also notable for being part of the "Blaise Pascal generation" at ÉNA.