The invention discloses a negative-pressure type agricultural seed storage tank. The negative-pressure type agricultural seed storage tank comprises a heat insulation shell, supporting legs are fixedon the bottom of the heat insulation shell, a mounting plate is fixed to the side face of the heat insulation shell, and an open source single chip microcomputer is mounted on the side face of the mounting plate; a storage tank body is connected with the interior of the heat insulation shell through a drive device, micro air holes are evenly formed in the bottom of the storage tank, and the storage tank is movably connected with the heat insulation shell through a sliding mechanism. According to the negative-pressure type agricultural seed storage tank, the drive device drives the storage tankbody to move relative to a stirring device, so that seeds in the storage tank body are stirred, and the seeds are subjected to heat dissipation and kept dry; the temperature and humidity of the interior of the heat insulation shell are adjusted through a temperature adjusting device and a humidity adjusting device, and the negative-pressure type agricultural seed storage tank has high adaptability, can meet different seed storage requirements, and meanwhile greatly prolongs the storage time of the seeds.