Traditional car cleaning is mainly manual,with slow cleaning efficiency and uneven cleaning effects.Introduc-ing PLC technology to achieve automatic car cleaning undoubtedly brings huge industrial benefits to the car washing indus-try.This paper designs a fully automatic car cleaning device based on PLC control technology and the characteristics of the car's appearance,which can improve the efficiency of car cleaning with minimal cost.Colleagues can save a lot of water and bring an efficient and green car washing experience.