The invention relates to the technical field of mechanical equipment, discloses a method for mechanically repelling pests inside production workshop line pipes and pipelines, and relates to existing production workshop line pipes or/and pipelines. The method is characterized by comprising the following steps that 1) a ventilation connector is installed in any position of various line pipes or/andpipelines of a production workshop; 2) a production pause period of the workshop is selected, the ventilation connector is connected with a gas production port of a nitrogen making machine or an ozonegenerator through a soft gas pipe, the gas flow in the line pipes or/and pipelines is kept smooth, the nitrogen making machine or the ozone generator is started, and high-purity nitrogen or ozone generated by the nitrogen making machine or the ozone generator is introduced into the line pipes or/and pipelines through the installed ventilation connector to repel or prevent the pests. By means of the method, rapid mechanical nitrogen filling and ozone can be conducted to prevent and repel the pests inside the production workshop line pipes and pipelines.