Abstract: An improved structure for book cover includes a cover layer, a left positioning plate and a right positioning plate, wherein the left and the right positioning plates are disposed above the cover layer and the edges of the cover layer can be folded inwardly for being adhered or stitched at the edges of the left and the right positioning plates, and the left and the right positioning plates respectively have a protruded left binding portion and a protruded right binding portion which both have plural holes corresponding to each other for fixing loose leaf papers between the left and the right positioning plates directly by a spiral so as to form a book. Through the improved structure of book cover in the present invention, the manufacturing process can be simplified and the cost of labor and material can be saved.