The invention provides a press-fitting device and a forming machine with the same. The press-fitting device comprises a rotating frame, a driving mechanism and a press-fitting mechanism, wherein the driving mechanism is connected to the rotating frame in a driving mode and is used for driving the rotating frame to rotate. The press-fitting mechanism is installed on the rotating frame and comprises a connecting assembly, gap adjusting assemblies, an installing assembly and a plurality of self-weight pressing plates, the connecting assembly is used for connecting the gap adjusting assemblies and the installing assembly to the rotating frame, the installing assembly comprises optical shafts, the self-weight pressing plates are sequentially arranged on the optical shafts in a sleeving mode and can move in the direction perpendicular to the optical shafts, and the gap adjusting assemblies are arranged at the two ends of the optical shafts and are used for adjusting the gaps between the self-weight pressing plates. The press-fitting device and the forming machine with the same have the advantages that the service life is long and the press-fitting effect is good.