Folding door is mainly composed of door frame, door leaf, driving part, rotating arm part, driving rod, orientation device, etc. The door type can be installed indoors and outdoors. Folding doors are mainly used for partition of workshops, shopping malls, office buildings, exhibition halls, home decoration and other places, as well as for screen use. The inner and outer doors can be installed and used. It can effectively play the role of temperature insulation, dust prevention, noise reduction and sound insulation, shielding, etc.