The invention discloses a gluing and bottom folding machine which comprises a first conveying belt, a second conveying belt, a first spray nozzle, a second spray nozzle, a first pressing wheel, a second pressing wheel, a third pressing wheel, a fourth pressing wheel, a first overturning device, a second overturning device, a first pressing flattening plate, a second pressing flattening plate, a first forming plate and a second forming plate. According to the gluing and bottom folding machine, the spray nozzles are used for spraying glue and can spray glue in different shapes according to a control device, and the gluing effect is good; the overturning devices are achieved through simple mechanisms, and the expected effect is achieved on the condition that the relative cost is lower; the working processes of overturning, gluing, folding, sizing and the like can be consecutively achieved for paper bag bottom pasting work through the machine system; the bottom pasting work is formed at a time, and the problems that in traditional processing, efficiency is low, the scrap rate is high, quality is poor, and manual labor intensity is high are solved.