The invention relates to a plastic injection molding process, in particular to an injection molding process of a dialysis dry powder bag plastic connector. The injection molding process comprises thefollowing steps of S1, material mixing; S2, feeding, wherein plastic particles in a material mixing machine are conveyed and fed into an injection molding machine; S3, heating and plasticizing, wherein the solid plastic particles are heated and plasticized in an injection molding machine to form molten plastic fluid which is then stored in the injection molding machine; S4, closed-mold injection molding, wherein an injection mold is closed, and the injection molding machine is used for injecting the plastic fluid in a molten state into the mold; S5, pressure maintaining, wherein the injectionmolding machine continuously pressurizes the interior of the mold; S6, cooling, wherein the injection mold is cooled through cooling water; and S7, mold opening, wherein the heat preservation temperature in the step S3 is 225-255 DEG C, the pressure maintained in the step S5 is 60-80 MPa which is kept for 10-13s, and the temperature of the cooling water in the step S6 is 15-18 DEG C. Products manufactured through the plastic injection molding process have good surface quality and gloss. The plastic injection molding process enables easy installation and realizes good sealing performance.