Provided is an electro-chemical water treatment apparatus and method for removing total nitrogen ingredients of ammonia nitrogen, nitrous acid nitrogen, nitrate nitrogen etc., organic materials of BOD and COD induction ingredients, and cyanogen included in wastewater and dirty water. The apparatus includes: a wastewater collection reservoir that contains wastewater; a wastewater storage retention reservoir that controls a hydrogen ion concentration (pH), an electrical conductivity and an amount of flow of wastewater; an electrolyte tank which makes the electrical conductivity of the wastewater as an electrical conductivity at which an electrolysis can be achieved; a pH conditioner tank that supplies a pH conditioner for the wastewater; an electrolyzer including an anode plate and a cathode plate, and a number of electrodes which are arranged as an electrification body between the anode plate and the cathode plate; and a controller which grasps state of wastewater and which is connected to the anode plate and the cathode plate to thereby control the electrolysis.