The present invention is an improved transparency scanning module, which is applied on a cover of scanning device. The transparency scanning module and the cover can be taken apart for different consuming groups. The features of the invention are that transparency scanning module is embedded in cover, and a slot of cover for holding transparency scanning module is set plural fillisters, and there are plural connectors set on the relative positions of transparency scanning module for connecting each other. When the fillisters connecting with the connectors, transparency scanning module is able to offer light and also transparency scanning module and cover are combined and fixed each other closely; on the other hand, rim of transparency scanning module is thinner, and most central part is protruding in z direction, thus transparency scanning module can be inserted and held in the slot of cover. This is another design for closely combination.