Paint spraying process and paint spraying device for paper-plastic packaging box

The invention belongs to the field of paper-plastic packaging box processing, and particularly relates to a paper-plastic packaging box paint spraying process which comprises the following steps: 1, cutting a paper-plastic packaging box, and removing redundant burrs of the packaging box; secondly, the paper-plastic packaging box is cleaned, ethyl alcohol is adopted for cleaning the surface of the paper-plastic packaging box, and grease, dust and impurities on the outer side of the paper-plastic packaging box are removed; thirdly, the part, without paint spraying, of the paper-plastic packaging box is covered; fourthly, colored paint is sprayed, spraying is conducted repeatedly so that coloring can be uniform, and after colored paint spraying is completed, the colored paint is put into a drying box to be dried for 1.1-1.5 h; 5, varnish is sprayed, a small amount of varnish is sprayed multiple times, the thickness of a varnish layer is made to be uniform, and the varnish is put into a drying box to be dried for