The invention discloses a product line maintenance system applied to surface mount technology in an electronic production field. The system is characterized in that the product line maintenance systemcomprises a maintenance control module, a warehouse material management module, an equipment concentrated remote control module, an automatic machine switching module, a system butt-joint module andan E-SOP management system; and the E-SOP management system is used for monitoring and managing working quality of the product line. According to the product line maintenance system, the maintenance control module, the warehouse material management module, the equipment concentrated remote control module, the automatic machine switching module, the system butt-joint module and the E-SOP managementsystem are combined; furthermore controlling and maintenance are performed on an early period in product, a middle period in production and a late period in production, thereby ensuring high operation stability in each period, ensuring stable subsequent working process, reducing product line defect rate, and effectively reducing resource wastage in the production process. According to the productline maintenance system, maintenance operation is divided and then integrated, thereby realizing unified control under a precondition of ensuring high step stability and effectively improving productline stability.