Pentastomid parasite Armillifer moniliformis, (A. moniliformis) is a pathogen causing human pentastomiasis. Pentastomiasis is a parasitic zoonosis, which has seldom been reported. When the number of armillifer parasites infecting a person is few or very few, the overwhelming majority of the cases are of asymptomatic or subclinical presentation and are generally discovered during autopsies or at surgical operation. A case of A. moniliformis, with heavy infection caused by nymphal pentastomids and possessing the clinical symptoms of chronic fever and abdominal pain, was admitted to the children’s hospital in Hangzhou, China. As the first case in China, it is hereby reported. Pentastomid parasite Armillifer moniliformis, (A. moniliformis) is a pathogen causing human pentastomiasis. When the number of armillifer parasites infecting a person is few or very few, the overwhelming majority of the cases are of asymptomatic or subclinical presentation and are generally discovered during autopsies or at surgical operation. A case of A. moniliformis, with heavy infection caused by nymphal pentastomids and possessing the clinical symptoms of chronic fever and abdominal pain, was admitted to the children’s hospital in Hangzhou, China. As the first case in China, it is hereby reported.