Pneumatic material pressing device and transfer die

The invention discloses a pneumatic material pressing device and a transfer die. The pneumatic material pressing device is used for being installed on an upper die part of the transfer die so as to tightly press a stamped part; the upper die part of the transfer die comprises an upper die plate and a plurality of sub-dies installed on the upper die plate and used for stamping and forming the part;the pneumatic material pressing device comprises material pressing mechanisms installed on the sub-dies; assembling cavities used for installing the material pressing mechanisms are formed in the sub-dies; the material pressing mechanisms and the assembling cavities are matched to form telescopic piston structures; and the pneumatic material pressing device further comprises a gas conveying mechanism used for communicating a compressed gas supply system with the assembling cavities and material pressing force adjusting mechanisms used for adjusting the amount of compressed gas conveyed into the assembling cavities of