Online type airtightness testing equipment and assembly line

The invention relates to the field of testing equipment, and provides online type airtightness testing equipment and an assembly line, which aim at solving the problem of failure to conveniently perform online airtightness testing on a target part by the existing testing equipment. The online type airtightness testing equipment comprises a machine frame, an airtightness testing assembly and a conveying assembly, wherein the airtightness testing assembly comprises a jacking air cylinder assembly and an airtight tool; the airtight tool is connected with the machine frame; the jacking air cylinder assembly is connected with the machine frame, and is correspondingly positioned under the airtight tool; the telescopic end of the jacking air cylinder assembly is used for jacking the target part on the telescopic end along the vertical direction, and the target part is closely attached with the airtight tool, so as to seal the to-be-tested cavity; the conveying assembly is used for bearing thetarget part, and conveyi