The invention discloses a plastic injection molding device with the cooling and cleaning functions. The plastic injection molding device is characterized by comprising an injection molding machine body, a feeding pipe, at least one flow rate detection assembly, at least one cooling assembly and a cleaning assembly, wherein the injection molding machine body is internally provided with an injectionmolding machine cavity, a feeding end is arranged on the injection molding machine body and is communicated with the injection molding machine cavity, the feeding pipe is communicated with the feeding end, the feeding end can convey materials to the injection molding machine cavity, the flow rate detection assemblies are arranged on the feeding pipe and can detect the flow rate in the feeding pipe, the cooling assemblies are arranged on one sides of the flow rate detection assemblies, correspond to the flow rate detection assemblies and the cooling assembly can cool the feeding pipe, and thecleaning assembly is arranged at the end part of the outer side of the feeding pipe and is used for cleaning residual materials in the feeding pipe so as to keep the feeding pipe to be unobstructed. The plastic injection molding device has the advantages that the structure is simple, the cooling effect is good, and blockage is effectively avoided.