In the specific production of precision plastic injection moulding processing plant, the variability of moisture and added components of raw materials has been a key issue affecting the quality of injection moulded parts, where moisture can easily lead to lack of material or porosity on the surface of injection moulded parts due to moisture problems. These defects can seriously affect the visual perception of the injection moulded parts and give the impression of poor quality. Moreover, too many holes can seriously lead to gaps in the injection moulded parts, which can affect the strength of the injection moulded parts and affect the use of functions. In the processing of injection moulded parts will also be plagued by the problem of unscientific technology, unscientific production process will lead to the overall plastic injection moulding process of injection moulded parts is unreasonable, injection moulded parts products sticky mould situation is due to improper filling of the mould caused by colour mixing will lead to injection moulded parts in the shape of marble-like black and white colour pattern, colour agent and raw material melt is bad are the specific reasons for its production. Failure to complete a high quality surface when mixing colours will produce melt marks, which will seriously affect the surface quality of the injection moulded part and affect the quality of the whole injection moulded part.