The invention discloses a pressing machine. The pressing machine comprises a machine body and a prepressing chamber, wherein the prepressing chamber is arranged on one side of the machine body, the top of the machine body is provided with hydraulic cylinders, sleeve rods are arranged on the front side and the rear side of the machine body separately, a vacuum pump is arranged on the rear side of the machine body, vibrating motors are arranged inside the machine body, and the vibrating motors are arranged on the top of a second lifting platform. According to the pressing machine, the prepressing chamber is arranged, hydraulic lifting rods push a first top mold to decline to abut against a first bottom mold, prepressing forming work is conducted on materials on the surface of the first bottom mold, and excess materials in the prepressing process are stored in a material storage chamber to be recycled; and a second top mold and a second bottom mold are connected through the second liftingplatform and a base, the hydraulic cylinders push the second lifting platform to move to enable the second top mold to be connected with the second bottom mold through insertion rods and insertion holes, integral connection is more stable, and the vibrating force of each vibrating motor is uniformly spread, so that the density degree of bricks is higher, and the forming cycle can be shortened.