The invention relates to printing stapling machinery, in particular to a book block transmitter of small paper-cover stapling machine linkage line. The invention provides a slope transmitter of small paper-cover stapling line, which comprises a slope table, a back baffle plate, a front baffle plate, a support sheath, a chain track, a transmission system, and an expansion device, wherein the back baffle plate is fixed on wall, the front baffle plate is connected and controlled by the support sheath, the slope table is at the bottom between the back and front baffle plates. The invention is characterized in that the slope table is composed of a short table, a middle table and a long table, the middle and short tables are arranged with a corner, the middle and long tables are arranged with a corner, the short table is provided with a vibration table before. The invention has compact structure, stable property, easy adjustment and operation, reasonable structure, stable transmission, and the application for resolving the problems of prior paper-cover machine which has few clamps and needs to arrange book block by hand, without linkage line. The invention can be used for small paper-cover stapling machine linkage line with few clamps.