The invention provides a fully biodegrade automotive protective film which comprises three layers, wherein two outer layers are prepared from the following components in parts by weight: 70-90 parts of PBAT (Polybutylene Terephthalate) and 10-30 parts of hydroxy-terminated iso-octyl polyacrylate; the intermediate layer is prepared from the following components in parts by weight: 100 parts of PLA(Polylactic Acid), 50-80 parts of a flexible modifier mixture and 0.5-1.0 part of a nucleating agent; a ratio of the thicknesses of the three layers is 1:1:1; the total thickness is 8-12 microns. Theprotective film is produced by a three-layer co-extrusion method; the hydroxy-terminated iso-octyl polyacrylate is added into the outer layer, so that the self-adhesion property of the protective filmis improved; blend of the PBAT and the hydroxy-terminated iso-octyl polyacrylate is adopted, the PLA with high strength is adopted on the inner layer, the nucleating agent is added to further improvethe transparency of the material, and the PLA is subjected to plasticized and toughened modification by adopting the flexible modifier mixture; the automotive protective film has excellent self-adhesion property and is excellent in flexibility, good in transparency and high in strength.