The invention discloses a vacuum die-casing machine. The vacuum die-casting machine comprises a bottom frame, a die-casing mechanism, an outer vacuum system and a vibrating device, wherein the die-casing mechanism is fixed to the bottom frame, and a cavity of the die-casing mechanism and the outside atmosphere communicate through the outer vacuum system; and the vibrating device is arranged on a fixing frame of the die-casing mechanism, a plurality of vibrating hammers are arranged on a rotary shaft of the vibrating device, and the vibrating hammers extend to the side face of the fixing frame and knock the fixing frame. Each vibrating hammer comprises a connecting rod movably arranged on the rotary shaft and hammer heads fixed to the two ends of the connecting rod, wherein the connecting rod comprises a first connecting rod body and a second connecting rod body connected with the first connecting rod body, and the first connecting rod body and the second connecting rod body are connected through a connecting device. According to the vacuum die-casting machine, by arranging the vibrating device, hot melt can be evenly distributed in the cavity in the forming process, molecules can be bonded more firmly, and the surface quality of a die casting is effectively improved.