The invention discloses a mechanism for feeding and discharging a collector tube into and out of a die. The mechanism is characterized in that a feeding push plate, a tooling plate and a feeding linear slide rail are mounted at the top of a rack, a collector tube placement groove and a collector tube blanking groove are formed in the tooling plate, the feeding push plate is connected with one end of the tooling plate, and the feeding push plate is also connected with the feeding linear slide rail. When the mechanism works, the only requirement is to place a collector tube on the collector tube placement groove, a translating cylinder works to enable the collector tube placement groove to be flush with a lower die, a feeding cylinder works to push the collector tube into a die groove and retreats, the translating cylinder returns, a positioning cylinder works, a positioning plate moves, a gap between an upper die and the lower die is sealed, a discharging cylinder works to push the collector tube backwards to the positioning plate and then returns, and a lower mandrel cylinder continues to work. As all automatic module and die technologies are automatically combined, the production efficiency is greatly improved, the product quality is guaranteed and the production cost is lowered.