To provide a net string for cultivating laver capable of producing the laver of high quality by blending titanium electrodes in the net string between which solar cells electrolyzes sea water to generate sodium hypochlorite, thereby killing disease bacteria, etc., causing the death of the culture laver form diseases.

In the seedling picking period and seedling raising priod of the cultivation laver 12, for the disease bacteria 11 or the like for making the cultivation laver 12 die from the disease, by the solar cells 6, the sodium hypochorite 10 is generated by the electrolysis of natural sea water 9 between these net string 5 and constitution is performed by the laver net strings 5 into which the titanium electrode 8 and a stainless electrode 16 are blended so as to accelerate the extension of the cultivation laver 12.