The invention provides a fully automatic high-concentration sodium hypochlorite generating system, comprising a pure water unit, a salt-dissolving unit, an electrolysis unit, a pickling unit, an alkali-dissolving unit, a cooling unit, an absorption unit and a dosing unit, the pure water unit and The salt-dissolving unit, the electrolysis unit, the pickling unit, and the alkali-dissolving unit are connected, and the electrolysis unit is connected with the salt-dissolving unit, the pickling unit, the alkali-dissolving unit, the cooling unit, and the absorption unit, and the absorption unit is connected to the The cooling unit is connected; the pure water unit, salt dissolving unit, electrolysis unit, pickling unit, alkali dissolving unit, cooling unit, absorption unit and dosing unit are controlled by the PLC control unit to automatically perform water replenishment, salt dissolution, flushing, Pickling, circulation, electrolysis and discharging actions. The invention can produce sodium hypochlorite solution fully automatically under the control of PLC.