Pediatric hydronephrosis is a common pediatric urological condition. The most common cause of hydronephrosis is hydronephrosis caused by stenosis of the pelvic-ureteral junction, often without obvious clinical symptoms, such as abdominal pain and urinary tract infection. With the popularity of prenatal diagnosis, hydronephrosis is being diagnosed earlier and earlier in a timely manner. For moderate and severe hydronephrosis requiring surgery, the earlier the surgery, the better the surgical efficacy. The traditional surgery is open disconnected pyeloureteroplasty, which has a higher success rate, but the surgical incision is larger and more traumatic for older children. Laparoscopic hydronephrosis includes abdominal access and retroperitoneal access disconnected pyeloureteroplasty, which requires high laparoscopic suturing and knot tying operations, and only a few pediatric urologists in China can master this technique. From July 1 to September 30, 2014, I went to SLK KLINIKEN in Heilbronn, Germany, for training in urological laparoscopy and robotic surgery under Professor Rassweiller, the world’s most famous urologist. All the patients had a smooth recovery, significantly shortened hospitalization time, and were very satisfied with the postoperative wound appearance, which was also well received by the parents of the children. We hope to provide better medical services for more and more patients with hydronephrosis through laparoscopic technology.