The invention relates to the technical field of packaging, in particular to a 
cardboard sticking device. The 
cardboard sticking device comprises a support frame; a 
crankshaft is arranged above the support frame; an 
adhesive spray box is vertically arranged between the 
crankshaft and the support frame; the 
adhesive spray box is tapered, and the big-
diameter end of the 
adhesive spray box is arrangedupwards; the bottom of the adhesive spray box is communicated with an adhesive spray 
pipe; the adhesive spray box is internally provided with a first 
piston in a sliding way, and the length of the first 
piston is the same as the 
diameter of the small-
diameter end of the adhesive spray box; the first 
piston is hinged with a first connecting rod, and the first connecting rod is hinged with a rod journal of the 
crankshaft; a conveying channel and a squeezing board are sequentially arranged at one side of the adhesive spray box; a 
conveyor belt is arranged at one side of an entrance of the conveying channel; a transmission part is connected between a driving wheel of the 
conveyor belt and the crankshaft; the squeezing board props against a 
cardboard and is provided with a rectangular groove;an incomplete gear is arranged in the rectangular groove and is connected with the crankshaft; driving teeth meshed with the incomplete gear are respectively arranged on a pair of side walls of the rectangular groove. The cardboard sticking device can realize automatic sticking of the cardboard and reduce the work load of workers.