Target detection technology is the core element of security monitoring,early warning detection,remote sensing imaging and other equipment,and is also one of the hotspots in the field of deep learning.Infrared detection system through passive reception of infrared electromagnetic waves emitted by the object for imaging,with high temperature sensitivity,detection distance,passive detection of concealment and other advantages,in the field of target detection has a wide range of applications.In this paper,from the characteristics of infrared dim small target images,the classification and description of deep learning based on visual image target detection algorithms are classified and described,and the effective means of deep learning in infrared weak small target detection are summarized,and finally an outlook on future development trends is made.