Necrotizing Fasciitis is essentially a severe inflammation of the muscle sheath that leads to necrosis of the subcutaneous tissue and adjacent fascia. The necrotizing fasciitis is a rare complication in obstetrics but when it occurs, it frequently presents as a fulminating disease. It is characterized clinically by fulminant tissue destruction, systemic signs of toxicity, and high mortality. Accurate diagnosis and appropriate treatment must include early surgical intervention and antibiotic therapy. We report a 22 years old female patient Gravida 1 Para 1, 1 living child, without pathological history, sub-saharian, admitted in emergency for suspicion of peritonitis on 4th day post cesarean section, to which necrotizing fasciitis was diagnosed. After resuscitation, the surgical debridement was done and the patient received the antibiotherapy, but the patient died in septic choc.