The invention provides a protecting device for vehicle transportation of PVC door skins. The protecting device comprises a placing base, a first observation window, a water storage tank, a fixing point, a returning rope, an extruding buoy, an inclined plate, a groove, a water inlet pipe, limiting clamping grooves, a spacing cover, limiting chucks, a second observation window, a bearing plate, placing holes, placing cylinders, positioning blocks, sliding grooves, sliding blocks, barb bulge blocks, first moving rods, drawing springs, second moving rods, stress blocks and fixing holes; the firstobservation window is embedded in the middle of the right side of the placing base; a through hole is formed in the middle of the left side of the placing base; and the water storage tank is welded inthe middle inside the placing base. When rolls are placed into the placing cylinders, the gravity of the bottoms of the rolls can be concentrated on the stress blocks, the drawing springs can be pulled by the second moving rods on two sides of each stress block, the first moving rods slide in the sliding grooves, the sliding blocks can clamp the outer sides of the rollers in the inclined states,the resistance is just formed to the bumping force produced during transportation, and then the stability of the rolls inside the placing cylinders can be improved.