Abstract: At present,due to the different shapes and sizes of pits,holes,cable channels and so on,it is difficult for the existing safety distribution devices to effectively shield the pit holes and other operating sites,and easily cause the heavy risk of personnel falling. In view of the above problems,an intelligent anti-falling device for pits and holes based on infrared radiation is designed. the device can monitors the site with real time by the principle of the infrared radiation,and remind the personnel entering the area by mistake to stay away from dangerous point by the sound and light alarm,the test results show that the device can well adapt to the deployment requirements of various irregular areas such as pits,holes and cable trenches. It has the advantages of convenient deployment and high reliability,which can effectively reduces the risk of personnel falling.