The invention relates to the technical field of die-casting die processing treatment accessory devices, in particular to a metal die press-casting device. A press block can automatically move to work,the working precision is high, a use effect is strong, and the practicability is high; moreover, the working efficiency of the device is high, convenience is brought to a user, and thus the use reliability of the device is improved; the device comprises a machine body, a connecting frame, a supporting frame and the press block, wherein a groove is formed in the bottom end of the press block; themachine body is internally provided with a working cavity, an opening is formed in the bottom end of the machine body, the device further comprises a servo motor, a driving gear, a driven gear, a chain, a threaded rod, a threaded pipe and a connecting board, a transmission shaft is arranged at the top output end of the servo motor, the driving gear and the driven gear are sleeved with the chain, and the press block is installed at the bottom end of the connecting board; an installation groove is formed in the top end of the supporting frame, and the device further comprises two left fixing frames, two right fixing frames, two transmission rollers, a transmission belt, a driving motor and conveyor belts, wherein the driving motor is installed above the installation groove.