Unit combination book

The utility model relates to an unit-type modular textbook. The textbook holder is made of transparent material. The utility model is characterized in that: the right outer layer bag and the left outer layer are united as one body, the two ends of the textbook holder respectively form a baggy body; the outside edges of the two baggy bodies is bounded with the right inner layer bag and the left inner layer bag; the textbook is an modular unit. The utility model has the advantages that: because the textbook holder is made of transparent material and the outer layer bags are designed specially, the front cover, the back cover and the lateral face of the textbook can be shown simultaneously, meanwhile, the page number of the textbook binding unit is flexible and can be determined according to needs; furthermore, the utility model has compact structure and can be used conveniently.