The invention relates to the technical field of mobile hard disks, in particular to a computer information safety protector which comprises a protection box, a sealing cover is hinged to the position, close to the rear end, of the outer surface of the upper end of the protection box, a first rectangular groove is formed in the outer surface of the upper end of the protection box, and a damping box is arranged in the first rectangular groove. A pop-up mechanism is arranged on the inner surface of the first rectangular groove, and a heat dissipation mechanism is arranged at the bottom end of the inner surface of the first rectangular groove; the pop-up mechanism comprises a first limiting groove, a rotating rod, a first gear, a tooth column, teeth, a through hole, a pull rope, a limiting hole and a second gear, a user opens the sealing cover, the damping box can be lifted upwards, the user can take out the mobile hard disk conveniently, meanwhile, after the mobile hard disk is used by the user, the mobile hard disk is put into the damping box, the sealing cover can be automatically closed by utilizing the self weight of the mobile hard disk, so that the protection degree of the device to the mobile hard disk is improved, the damage probability of the mobile hard disk is reduced, and the use efficiency of the device is improved.