The invention discloses an automatic and quantitative gluing plate jointing device of short and small battens and a gluing plate jointing method. The device comprises a side automatic and quantitativegluing device and a fixed-length width jointing, assembling and pre-pressing device. The side automatic and quantitative gluing device comprising a gluing rack, a conveying belt, a glue box, a glue application tooth roller, a glue application tooth roller support, a U-shaped glue scraping roller, a U-shaped glue scraping roller support, a backer, a flexible guide plate and a guide plate transverse adjusting mechanism. The fixed-length width jointing, assembling and pre-pressing device comprises an assembling rack, a workbench plate, a width backer, a length backer, a side press plate and sidepress plate air cylinders. According to the side automatic and quantitative gluing device of the device, the glue application tooth roller can be used for gluing the sides of the short and small battens, and control over quantitative glue layer thickness is achieved through the U-shaped glue scraping roller; the fixed-length width jointing, assembling and pre-pressing device can achieve fixed-length width jointing of the short and small battens; and the process and the device are simple, the automation degree is high, the production cost is low, the production efficiency is high, no glue markcontamination exists on the plate faces, and the device can be widely applied to materials of solid wood furniture, core-boards and the like.