The invention discloses PET (polyethylene terephthalate) / montmorillonite nano composite special for engineering plastic, manufactured from, by weight, 58-60 parts of PET resin, 20-22 parts of polyvinylidene fluoride, 5-7 parts of montmorillonite, 1.4-1.8 parts of nano alumina, 6-8 parts of carbon fiber, 0.7-0.9 part of zinc powder, 0.1-0.2 part of benzotriazole, 7-9 parts of gypsum fiber, 1.8-2.5 parts of ferrocenecarboxylic acid, 6-8 parts of methyldiethanolamine, 1.5-1.8 parts of dodecyl trimethyl ammonium chloride, and suitable water; by combining with the advantages in PET resin and polyvinylidene fluoride, the properties of the composite, such as corrosion resistance, wear resistance and impact resistance, are improved; by combining the added carbon fiber and zinc powder to the materials, the prepared composite has good electrical conductivity, significant antistatic effect, light weight and high strength; when used in engineering plastic, the composite has the properties meeting normal use, is easier to cut, and is highly worthy of marketing and application.