Invasive mucormycosis is an opportunistic fungal infection that commonly involves the rhinocerebral and pulmonary system. We are presenting a rare case of small intestine invasive mucormycosis causing multiple perforations and gangrene in the small intestine. Mucormycosis infection occurred after traumatic perforation peritonitis. Mucormycosis usually occurs in the presence of predisposing conditions like uncontrolled diabetes mellitus, neutropenia, underlying malignancy, or those receiving immunosuppressive agents. Gastrointestinal mucormycosis is uncommon and seldom diagnosed in living patients. In these cases, diagnosis is delayed and the mortality rate is high.