Optical fiber sensor is mainly composed of light source, optical fiber, photo detector and signal processing part. The Internet of things is based on Internet with RFID technology, infrared sensors, GPS and laser scanners and other information sensing equipment items and Internet connection. Optical fiber sensor for its many advantages of light weight, high sensitivity, strong anti electromagnetic interference ability, and it is the security of data transmission, etc. This paper analyzes the application of optical fiber sensor in Internet of things