A 4-year-old boy with a painless mass for 3 years in the left scrotum was admitted to the hospital. Three testicle-like substances could be palpable one by one from groin to scrotum on the left side during physical examination. The upper and middle parts were slightly hard, while the lower part was slightly soft. The splenogonadal fusion (SGF) in the left side was found by laparoscopy after admission. Accessory splenectomy was performed with preservation of the left testicle. Postoperative follow-up was 18 months. The testicles were well developed without atrophy, and abdominal B-ultrasound showed no abnormality in liver, gallbladder and spleen. SGF was a rare congenital abnormality, which was difficult to diagnose preoperatively. During the operation, if the SGF was found, accessory splenectomy with testicle-sparing should be performed. Laparoscope can be used as an effective diagnosis and treatment method to improve the understanding of SGF, and avoid unnecessary orchiectomy.