Air tightness detection tool for battery pack box body

The utility model discloses a battery pack box airtightness detection tool, and relates to the technical field of air leakage detection, the battery pack box airtightness detection tool comprises at least one pressing mechanism (1), a liquid storage tank (2) and a bubble liquid coating device (3), the liquid storage tank (2) is fixedly connected to the bubble liquid coating device (3), the bubble liquid coating device is fixedly connected to the at least one pressing mechanism (1), and the liquid storage tank (2) is fixedly connected to the at least one pressing mechanism (1). The at least one pressing mechanism (1) drives the bubble liquid coating device (3) to press downwards, the bubble liquid coating device (3) is pressed on a welding seam of a battery pack box body (4) in an inverted state, liquid in the liquid storage tank (2) flows into the bubble liquid coating device (3), and the welding seam of the battery pack box body (4) to be detected is coated with the liquid through the bubble liquid coating d