The invention relates to an 
injection molding machine feeding device which comprises a 
material storage box, a conveying device and a material conveying 
barrel, a material pumping cover and a 
material storage cavity are arranged on the material conveying 
barrel, a material pumping 
pipe is arranged on the material pumping cover, a material pumping 
air blower is arranged on the material pumping 
pipe, the conveying device comprises a spiral 
propeller, a driving motor and a material conveying 
pipe fitting, and the material conveying 
barrel is provided with a communicating opening and a valve 
assembly. The valve 
assembly comprises a 
rotating disc, a driving gear ring and a driving rack, the 
rotating disc is sleeved with a torsional spring, an embedding groove is formed in the bottom wall of the 
material storage cavity, a microswitch is fixed to the bottom wall of the embedding groove, a 
magnet is arranged on the groove wall of the embedding groove, the driving rack is provided with a connecting chain, an air suction hole is formed in the material pumping cover, and a stirring piece is coaxially arranged on the rotating part. According to the automatic feeding device, automatic feeding can be conducted on the 
multiple injection molding machines at the same time, and convenience is achieved; and by arranging the valve 
assembly and the microswitch, when the material particles in one material conveying barrel are lacked, the valve assembly automatically opens the communicating opening, the driving motor drives the spiral 
propeller to rotate, the material particles are automatically supplemented, and great convenience is achieved.