Sodium hypochlorite preparation device

The invention provides a sodium hypochlorite preparation device which comprises a shell and a pole core arranged in the shell, and the pole core comprises two end electrodes and at least one composite pole plate group; each end electrode comprises an electric connecting piece, a conductive fastening piece and a plurality of first polar plates which are sequentially stacked, and a gap is formed between every two adjacent first polar plates; the electric connecting piece comprises a conducting rod and an electrode holder, one part of the electrode holder is inserted into a gap between two adjacent first polar plates and is in contact with the first polar plates, and the other part of the electrode holder extends to one side of each first polar plate; in the stacking direction of the plurality of first polar plates, the conductive fastener simultaneously penetrates through the plurality of first polar plates and the electrode holder, so that the plurality of first polar plates and the electrode holder in the end