At present, the commonly used anti-collision crown block device is based on a single chip microcomputer, and the sensor is installed on the drum. However, because the temperature at the side of the drum exceeds 80 ℃ when working, the sensor is very easy to fail, and the single chip microcomputer is not suitable for long-term use in harsh environments. Therefore, through the analysis of the working environment, principle and process of the intelligent anti-collision crown block device, this design uses PLC as the main controller,