Nigeria in its attempt to establish peace faced series of challenges, as the nation encountered serious issues, which was as a result of its diverse ethnicity. This multiethnic reality plagued by the economic, religious and sociopolitical conflict continued to torture the nation and its peoples, undermining the country‟s development as well as threatened its corporate existence as one indivisible nation. The study identified poor treatment of prisoners with pitiable restorative justice as the underlining results of conflict and insecurity in the country. The study noted that mere contact with the institution of prison in the country most often that, made such person who is that is not tough to be more hardened in such a way that the person can now indulge in criminal activities upon his or her release, with the possibility of relapsing into criminal activities which generated high frequency of recidivism; thus, making prisons in the country, a breeding ground for criminals, terrorists and law breakers. This situation continued to threaten the peacebuiding process of the nation. The paper however concludes that, to tackle the security challenges threatening the peace of the nation, the Nigerian government have to bring about reforms and healing programmes that considered prisoners‟ welfare. The Nigerian Prison Service had ideal plans for rehabilitations and re-integrations, but lacked enough will power or funds to accommodate such plans. Thus, the study is concerned with the failure of peacebuilding process in the face of several prisons reforms, as they affected the rehabilitation and restoration of prisoners.