The utility model relates to the technical field of book and periodical printing, in particular to a section binding device. The section binding device comprises a section conveying device and a section feeding device and further comprises a paging nozzle and a book dividing rod. The section feeding device comprises an outer section feeding frame and an inner section feeding frame. The paging nozzle is located in an area of the section conveying device corresponding to the space between the outer section feeding frame and an inner section feeding frame, and the book dividing rod is located in an area of the section conveying device corresponding to the space between the paging nozzle and the inner section feeding frame. The section binding device combines the outer section and the inner section into one section, is capable of reducing sections by a half in the paging production process, shortens production time of the corresponding line locking work procedures, effectively improves production efficiency, reduces device investment and reduces device cost correspondingly.