Severe SARS-CoV-2 infections in pediatrics are rare and usually presented as multisystem inflammatory syndrome in children. There are few descriptions about pediatric oncology patients. We describe a case of 5-year-old male with acute myeloid leukemia. He presented febrile neutropenia with skin lesions and progressive clinical worsening. He had positive RT-PCR test for SARS-CoV-2 and criteria for MIS-C. He received methylprednisolone, immunoglobulin and granulocyte-colony-stimulating factor. Anti-interleukin 6 was administrated due to severe lung disease and refractory to treatment, presenting response and slow clinical recovery. Chemotherapy was restarted, he didn't present relapse during treatment and has no sequelae of COVID-19.