The invention discloses a dispensing cylinder. The dispensing cylinder comprises a body, a first end cover and a second end cover, wherein the first end cover and the second end cover are arranged at the two ends of the body. Two piston rods are arranged between the first end cover and the second end cover. The ends, connected with the first end cover, of the piston rods are further connected with a piston. The piston is connected with the body. The body is further connected with a first pressing block. Second O-shaped rings are arranged between the first pressing block and the body and are connected with springs. Spring base cushions are sequentially connected with second seal gaskets and third seal gaskets. The third seal gaskets are connected with third O-shaped rings. The ends, connected with the second end cover, of the piston rods are further connected with fourth O-shaped rings and adjustment blocks. The fourth O-shaped rings are connected with first seal gaskets. The first seal gaskets are connected with a pressing plate. The second end cover is further connected with an end cover screw sleeve and a fifth O-shaped ring. The dispensing cylinder is widely used in automatic dispenser devices, and the sizes of all parts strictly meet the use requirements; and two glue outlets are formed, two types of glue can be mixed, and the ratio of the two types of glue can be controlled through the sizes of the glue outlets.