The invention relates to a tobacco storage device, in particular to a closed type tobacco storage cabinet. Protective covers are arranged on the tops of storage tanks of the storage cabinet, on the tops of material spreading trolleys of the storage cabinet and on the top of a transverse travelling trolley of the storage cabinet for sealing; each protective cover comprises dustproof folding nylon cloth, frameworks and connecting plates; the two ends of each of opposite surfaces of each connecting plate and the corresponding framework are hinged to tie bars; the two ends of each of opposite surfaces of every two adjacent frameworks are also hinged to tie bars; the tie bars at the same end of every two opposite surfaces are inwards hinged with each other in a certain angle; and tension springs are arranged between the tie bars at the two ends of each framework and each connecting plate. According to the closed type tobacco storage cabinet, the frameworks are arranged under the dustproof folding nylon cloth, and the two ends of each framework are symmetrically equipped with the tie bars, so that the integral structure of each protective cover is more firm, and the unfolding-folding process of each protective cover is more stable; and rollers are arranged on the lower parts at the two ends of each framework, so that friction between the protective covers and the cabinet body is reduced, and operation is more smooth; and bent structures are arranged at the lower ends of the frameworks, so that integral stability of the protective covers is better.