Agricultural machinery powder coating line adopts the chain plate towing plane workpiece transfer movement, to achieve the purpose of production process, effectively adjust the assembly process of automatic powder coating line operation of the factory, the reasonable distribution of each procedure; and in the production line for free online detection and automatic assembly powder coating machine, the implementation of product quality control and operation status of equipment effective monitoring, to provide the necessary protection for mass production, can effectively control the pipeline production time, improve the stability and efficiency of production line operation.