This paper studies the physical and chemical properties and construction process parameters of crane chassis armor coating,and expounds the construction experience of crane chassis armor spraying of crane products.The experimental results show that the physical properties,salt spray resistance and aging resistance of the chassis armor coating can meet the basic requirements of construction machinery coating,after spraying the armor coating,the salt spray resistance performance of the coating parts and electroplating parts is improved significantly,which can meet the requirements of medium durability anti-corrosion in C4environment.