Cooling tunnel is automatic filling packaging production line, a common auxiliary equipment, especially the high temperature automatic filling production line, it is to combine high temperature filling machine and automatic packaging production line in a automatic production line must be a kind of auxiliary equipment. The main effect of it on the production line is a rapid succession after filling bottles of cooling products and containers (without changing the quality of the hot filling bottle filling medium and under the premise of mouth filling and container appearance), turn on after a period of continuous packaging products, and after the period of the equipment for packaging production line to the cushioning effect.