The end plates of tubular lignite drying machine are made by circular super-thick steel plate,on which there are a large number of drilled circular holes. This structure is mainly accomplished by welding and machining with heavy weight,a lot of welds,a large quantity of welding tasks,and high requirements on parts machining and assembly accuracy,so its quality is very strict in manufacturing. According to the structure of the end plates of tubular lignite drying machine,the reasonable welding and machining technologies and quality control for key parts are summarized to provide reference for the production of other large-scale rotating mechanical equipments.