Abstract: Addressing the problems of the existing steel tube pickling operation line like man power-consuming， poor operation conditions and difficult controlling of pickling quality，etc.， a complete package of technology and equipment of an automatic pickling line is developed. Described here in the article are the functional characteristics and control types of this operation line's main technological equipment，covering such devices as the transport car， the turbulent pickling bath，and the jacket type phosphorizing bath. Also elaborated are the four major automation technologies as used in the production process，i.e.，the automatic production logistics，the automatic liquid system distribution and fluid infusion，and the automatic circulating，filtering and heating of acid solution，etc. The automatic pickling line is in possession of a lot of advantages namely，clean operation，energy-saving，low waste discharge， and being more environment-friendly and labor intensity-reducing，which is worth spreading up.