Disclosed is an electrostatic field water treatment apparatus comprising: a high voltage unit to which a high voltage is to be supplied, and an earth ground unit connected to an earth ground and used as a pipe through which water is to pass, wherein the high voltage unit is disposed at a central part of the earth ground unit and comprises a high voltage insulation cable to which a high voltage is to be supplied and an electrode case configured to cover the high voltage insulation cable and consisting of an insulator.