The invention discloses a breathable film production line through a blow molding method. The production line comprises a breathable film blow molding device, a longitudinal stretching device and a winding device, and further comprises an edge dividing traction device and two deep embossing devices, and the edge dividing traction device divides a breathable film into two paths and conveys the breathable film to the two deep embossing devices; each deep embossing device comprises a deep embossing rubber roller arranged on the deep embossing device body, a deep embossing roller arranged below thedeep embossing rubber roller, a first cooling roller and a second cooling roller, wherein the first cooling roller and the second cooling roller are arranged on the downstream portion of the deep embossing roller. Each deep embossing device further comprises a guide roller, and the breathable film can be conveyed to the first cooling rollers through the guide rollers. According to the method, thedeep embossing procedure and the breathable film production procedure are combined, the embossing mode can be flexibly selected, the air permeability can be effectively controlled, and the application range is wide.