Airtightness detection tool assembly

The invention provides an airtightness detection tool assembly, and relates to the technical field of oil pump shell detection. The air tightness detection tool assembly comprises a press machine with a workbench and a sliding table, a bottom plate, a top plate, a front fixed seat, a left fixed seat, a right fixed seat, a shell, a compressed air source and an air pressure detection device. According to the invention, the conical opening is designed at the end of the sealing groove structure to prevent the fourth sealing strip from bulging from the right side after being compressed and filled, and the limiting groove is formed in the lower wall of the inner side of the conical opening to further ensure the limiting of the fourth sealing strip; the pressure sensors located on the same plane can detect whether the combination surfaces are completely attached or not, and when burrs or foreign matters exist on the end face or the bottom face of the shell, the pressure sensors at all positions can detect different