The anti-corrosion maintenance workload of railway fasteners and bolts in China is large, and the cost of manual lubrication operation is high, the efficiency is low, and the labor intensity is high, and there are problems such as operation safety risks and ballast pollution. In order to solve this series of problems, an automatic lubrication device based on Programmable Logic Controller（PLC） control that can automatically lubricate fasteners and bolts on railway tracks was developed to realize the efficiency, intelligence and automation of the construction process. Optimize the design of the equipment"s traveling mechanism, lubrication system, fastener bolt identification and sensing device, control system, etc. The adjustable spraying structure is innovatively designed to realize the oil coating operation of different types of tracks, and the sensor device that can adapt to the change of the height and position of the rail fastener bolts is innovatively designed, so as to realize the accurate identification of the track fastener bolts with different height distribution. According to the characteristics of anti-rust grease, the quantitative atomization technology of the device was analyzed and optimized. Delta"s DVP ES2-24MR PLC is connected to