The work aims to make improvements from the seam welding machine, combination machine, oven and other links to solve the problem of high rejection rate regarding the phenomenon that the automatic production line of convenient buckets of Zhengzhou X canning factory has many faults. Firstly, the phenomenon of failure was described by means of on-site photo forensics; secondly, the causes and hazards of the failure were analyzed; then, the relevant technicians conducted in-deep discussion, and finally the specific improvement measures were proposed for each failure link by consulting the relevant materials. It was applied to automatic production line of convenient bucket. After the corresponding improvement measures were implemented in the production line, the rate of industrial waste was reduced from 0.464% to 0.129%, providing a basis for the improvement of automatic production lines of convenient buckets in the canning industry. The problems in the canning process are mostly caused by seam welding machines, combination machines, ovens, etc. Enterprises should strictly control these aspects and adopt corresponding improvement measures to reduce the rejection rate.