The utility model discloses a drop -out case packer with depressurization mechanism, the drop -out case packer is including being used for accepting the microscope carrier that falls the article, the top edge of microscope carrier outwards extends the formation extension along the horizontal direction, pressure relief mechanism includes that the vertical direction in at least two sets of edge wears to locate the elasticity guiding mechanism in the extension, elasticity guiding mechanism includes that it wears to locate the guide bar in the extension to follow vertical direction, the cover is located on the guide bar and elastic component that be located the extension below, the drop -out case packer is still including the actuating mechanism who is used for driving the microscope carrier downstream who locates microscope carrier top. The utility model discloses the device is through adopting elasticity guiding mechanism, and the extension microscope carrier falls the operational time of in -process bearing capacity at the article, reduces fatigue fracture's peak stress, the extension plant maintenance cycle, the in -process spring that falls at the article lasts the compressed, constantly reduces the cylinder and is used in the effort on the microscope carrier to the cylinder has been protected, still show simultaneously the level of noise that reduces around the operational environment, improving operational environment.