The present invention provides a rolling shutter door device. It includes rolling shutter and guideway, in which the described rolling shutter is formed from sheet material main body and several skeleton materials which are respectively arranged in the upper portion and lower portion of said sheet material main body and mutually spaced according to a certain interval. The described guideway can be used for receiving and guiding two ends of said rolling shutter. In the described rolling shutter door device at least more than one skeleton material positioned in the lower end position in severalskeleton materials can be formed from skeleton material main body and free separation end portions which are respectively removable placed on the left and right two end positions of said skeleton material main body. Besides, said invention also provides the working principle of said rolling shutter door device and its concrete operation method.