Automobile dent repair is a simple and understandable repair technology. Its main purpose is to restore the concave part of the car paint surface to its original state, which is also called automobile micro-sheet metal or nondestructive sheet metal repair (called abroad). Usually, the concave with convex angle and obtuse angle can be restored to its original state, but the concave part without paint dropping can be perfectly repaired, and the hail hole can also be removed, but the corner and AB column can not be repaired well. Automobile dent repair technology is based on the principles of optics, physics and mechanics, and uses the lever principle to repair dents of different sizes caused by external forces. As long as the paint surface is not damaged and the metal surface is not overstretched. This technology is a modern technology and an international advanced technology, which is used to repair dents formed by external forces in different parts of automobile appearance. The repair time is very short (about 20-40 minutes), which greatly reduces the cost (only about 50% of traditional sheet metal and painting). After repair, the sunken part will never be deformed or faded, and can be completely restored to its original state, and the car will once again show its elegance and beauty. Whether it is the door, mechanism cover, front wing, rear hatch cover, etc. More than 90% can be repaired. Repairing car dents requires different tools. For example, use a crowbar to restore the dent to its original state, use a rubber hammer to repair the overall shape, and use tip to fine-tune the protruding part. The maintenance price varies with the model, scar size and maintenance time. Although the repair technology of automobile dent has some defects such as inconvenient repair of rear wheel eyebrow, corner and AB column, its advantages are obvious: low maintenance cost, short repair time and no influence on vehicle residual value. If it is necessary to repair the car appearance, the car dent repair technology is a very recommended technical choice.