Injection mechanism of injection molding machine and injection molding machine

The utility model discloses an injection mechanism of an injection molding machine and the injection molding machine, and the injection mechanism comprises a rack which is provided with an injection molding seat which is provided with a charging barrel; the screw rod is movably arranged in the charging barrel; the driving device can drive the screw rod to rotate; the oil cylinder assembly comprises a cylinder barrel and a piston, the piston is movably arranged in the cylinder barrel, at least part of the power output end of the driving device penetrates through the cylinder barrel and the piston, and the piston can drive the screw to move in a reciprocating mode; and the anti-rotation structure is arranged between the rack and the piston, and the anti-rotation structure can limit the piston to rotate relative to the cylinder barrel. With the adoption of the structure, the rotation of the piston relative to the cylinder barrel is limited by arranging the anti-rotation structure, so that the piston can only axi