Workpiece air tightness detection device

The utility model discloses a workpiece air tightness detection device, which comprises a machine base, a sliding block, a pressing assembly, a driving part, air pressure detection equipment, two magnetic attraction structures and an alignment structure, the machine base is provided with a placement station and a detection station which are arranged along a first direction, and the sliding block is movably arranged along the first direction. The moving stroke of the sliding block passes through a placement station and a detection station, a placement area is formed on the sliding block, the downward pressing assembly comprises a mounting shell arranged corresponding to the detection station of the machine base, a guide-in opening is formed in one side of the mounting shell in the first direction, and the sliding block can be guided into the mounting shell from the guide-in opening; the downward pressing assembly further comprises a downward pressing part and an air blowing part which move in the vertical dire