"5G+Industrial Internet"is an information system supported by big data,Internet of Things,industrial control systems,etc.It faces many security threats during the operation of this system.Therefore,this article briefly introduces the security threats faced by"5G+Industrial Internet",discusses the"5G+Industrial Internet"security protection design plan,and further explores the key points of"5G+Industrial Internet"security protection design,hoping to provide some reference for the safe operation of"5G+Industrial Internet".