The method is to put curing materials on the inner wall of the pipe and use UV light to shine for curing to form a new pipe wall inner lining layer.However,there are also some problems in the construction process of this technology,such as difficult detection and positioning,poor surface pretreatment effect,difficult preparation of inner lining curing materials,and difficult UV lamp positioning,which seriously affect the repair effect.This paper analyzes the difficulties in the practical application of UV light inner lining curing trenchless repair technology,and puts forward corresponding countermeasures,aiming to provide reference for relevant personnel and promote the continuous development and progress of trenchless repair technology for urban drainage pipelines.