Background: Coronavirus disease 2019 (COVID-19) has become a constant threat to people's lives, bringing huge challenges to the global public health and medical service system. In order to ensure the timeliness and reliability of the recommendations in guidelines, the working group of the Rapid Advice Guidelines for Management of Children with COVID-19 decided to update the guideline to incorporate the latest evidence to guide the management of COVID-19 in children and adolescent. Methods: We will update the guidelines, originally developed as a rapid advice guideline, into a standard guideline. We will follow the clinical practice guideline (CPG) update manuals of the National Institute for Health and Clinical Excellence (NICE) and the Spanish National Health System (SNHS). The updated guidelines will also follow the RIGHT (Reporting Items for Practice Guidelines in Healthcare) checklist and Checklist for the Reporting of Updated Guidelines (CheckUp). Discussion: Through systematic search, evaluation and grading of the best available relevant clinical evidence, combined with the experience of frontline clinical experts in the fight against the epidemic and the wishes of patients and their caretakers, we will update our previous rapid advice guidelines into a high-quality, implementable standard guidelines for the management of COVID-19 in children and adolescent.