Air leakage detection device

The utility model discloses an air leakage detection device, which is used for detecting whether a vacuum package in a closed container leaks air or not, and comprises a magnetic sheet, a coil magnet, an oscillation circuit board and a power supply, and the magnetic sheet is positioned in the closed container and is partially attached to the surface of the vacuum package; the coil magnet is located outside the closed container and is provided with an induction end and an output end which are opposite to each other, and the output end directly faces the magnetic sheet; the oscillation circuit board is over against the induction end of the coil magnet, and a preset distance is kept between the oscillation circuit board and the coil magnet; positive and negative electrodes of the power supply are respectively in electric signal connection with positive and negative electrodes of the oscillation circuit board. According to the air leakage detection device, through the action of oscillation current in the oscillat