The invention discloses a material
injection device of a
die casting machine. The material
injection device comprise a material cylinder and a
plunger, wherein the material cylinder is used for containing
molten metal liquid, the
plunger is arranged in an inner cavity of the material cylinder, the material cylinder comprises a flat part and a gooseneck part which are in transition connection by an inclining part, the lowest point of the inclining part is lower than the lowest point of a material outlet of the gooseneck part, the
plunger comprises a plunger head and a second plunger head which are connected by a plunger rod, a non-pressure chamber for containing the
molten metal liquid is formed among the plunger head, the second plunger head, the plunger rod and the flat part, a pressure chamber for containing to-be-injected
molten metal liquid is formed among the plunger head, the gooseneck part and the flat part, and a one-way flowing device is arranged between the non-pressure chamber and the pressure chamber, is sealed during material injection, and is opened in the plunger resetting process. The material
injection device of the
die casting machine has the advantages that the
die casting cycle is short, the production efficiency is high, the qualified rate of products is higher, the
heating temperature of the
metal liquid is lowered, and the service life of a die and other parts is prolonged.