Abstract: Dyeing wastewater treatment with activated carbon fiber as an electrode were studied. The effects of electrode materials, voltage, electrolysis time and electrolyte on dyeing wastewater treatment with the electrochemical method were investigated. The result shows that the decolouring rate can reach above 96.1%, and the ratio of removing COD is 56.78% under the condition of ACF as a cathode, ACF+stainless steel material as an anode, the-voltage being 15 V, the electrolysis time being 30 min, the amount of NaCl as electrolyte being 5 kg/t. After electrolysis, adding a little of CaO in the wastewater can solve the problem of recolouring. It is proved that ACF is a type of catalyzing electrode material.