Abstract： Objective:To explore the safety and efficacy of robot-assisted laparoscopic pyeloplasty (RALP) for recurrent ureteropelvic junction obstruction (UPJO) in children.Methods:From November 2016 to February 2021, retrospective review was conducted for 9 children with recurrent UPJO after pyeloplasty.During RALP, peri-operative data were collected.The indications of reoperation included recurrent symptoms such as abdominal pain and urinary tract infection after standardized anti-infection treatment.Hydronephrosis worsened during follow-ups.Obstructive scintigraphy hinted at a deterioration of differential renal function >5%.Successful reconstruction was defined as resolution of symptoms, resolved or improved hydronephrosis and there was no need for additional procedures.Results:All operations were completed without any conversion into open surgery or blood transfusion.Mean total operative time was (231.8±73.1) min, mean dissection time to ureteropelvic junction (91.9±30.4) min, mean anastomotic time (36.6±7.2) min, mean blood loss (14.0±10.3) ml, mean postoperative hospital time (7.7±4.6) days and mean follow-up period (37.0±18.8) months.Only one child had a complication of Clavien-Dindo classification II.All symptoms disappeared and hydronephrosis improved with a removal of D-J stent.Conclusions:RALP is both safe and effective for recurrent UPJO in children.