This article provides a detailed introduction to the series-parallel composite automatic spraying system for rail transit vehicles from various aspects,including overall layout,the main structure of the spraying robot,automatic paint supply and mixing system,external extension axes,three-dimensional operation plaform,central control room,three-dimensional simulation programming and verification,and spraying process parameters.It also discusses the advantages of the series-parallel composite automatic spraying system in terms of usage efficiency,spraying coverage,and production assurance capabilities.Additionally,by comparing and analyzing the actual effects of manual and automatic spraying,the article proposes optimization directions for the existing issues in the series-parallel composite automatic spraying system.