The utility model discloses an infrared detector system for being directed at infrared conduction optical fiber outlet end sub -array row scan, it includes: fixed grillage, it locates infrared conduction optical fiber outlet terminal department, the longitudinal rail, it is located on the fixed grillage, horizontal support, its extending direction is perpendicular with the extending direction of longitudinal rail, and with longitudinal rail sliding connections, infrared detector, it is located on the horizontal support to set up as that can follow horizontal support removes, the horizontal drive device, its with infrared detector connects to the drive infrared detector remove along horizontal support, the vertical drive device, its with horizontal leg joint to drive horizontal support along the longitudinal rail removes. The utility model discloses at least can be only with an infrared detector to reduce cost avoids introducing the system error that first device performance parameter difference leads to simultaneously as far as possible. Infrared filtering lens can the partly ambient noise of filtering, reduces system error.