With the rapid development of nondestructive testing technology and unmanned equipment technology,unmanned inspection of external wall insulation system is gradually becoming a reality.This article takes thin-plastered exterior wall insulation system as the research object,and carries out detailed study on current situation and characteristics of unmanned equipment inspection.On this basis,it focuses on the analysis of un-manned infrared inspection technology,puts forward its optimization scheme,and improves the accuracy and recall rate through the algorithm optimi-zation of inspection image processing.