The invention discloses a quantitative gluing device. The quantitative gluing device comprises a first rack, a right vertical base, a left vertical base, a coating mechanism, a distributing mechanism, a pushing mechanism, a first motor, a transmission mechanism, a feeding adapter tube, a second rack, a first servo motor, a first lead screw, a first feeding nut, a first slide base, a first pushing head, a first pushing rod, a first piston, a cylinder barrel, a glue absorbing control mechanism, a glue outlet control mechanism, a stand column, a material barrel, a heating mechanism, a soft connector, a ruler and a transparent rubber tube. When the first piston moves rightwards, a glue solution in the material barrel enters the cylinder barrel; the first piston moves leftwards for pressing the glue solution in the cylinder barrel into the distributing mechanism; the pushing mechanism pushes the glue solution to be uniformly discharged through the distributing mechanism; a glue hanging slot in the surface of a metal roller uniformly adsorbs the glue solution discharged by the distributing mechanism; and the metal roller uniformly coats the surfaces of materials which continuously pass with the glue solution. The quantitative gluing device is simple in structure, can quantitatively absorb and convey glue, realizes uniform and continuous coating, is good in sealing performance, and is high in degree of automation.