In children, the most typical soft tissue tumor is a rhabdomyosarcoma (RMS). A primary intratesticular rhabdomyosarcoma is quite uncommon. An eleven-year-old had a painless left testicular tumor for two months. The patient's left scrotum was found to have a firm, non-tender lump. A massive hypoechoic intratesticular mass measuring 8.0 × 7.5 × 6.0 cm was found in the left scrotum by scrotal and abdominal ultrasonography. The patient had an inguinal orchiectomy. Histopathological examination disclosed botryoid rhabdomyosarcoma. Primary intratesticular rhabdomyosarcomas are rare. Radical orchiectomy and chemotherapy are recommended. It may increase overall and disease-free survival.