Water treatment method and electrolysis device

The invention discloses a water treatment method and an electrolysis device, and relates to the technical field of water treatment. The water treatment method comprises the steps that an electrolytic cell is arranged, the electrolytic cell is provided with an anolyte cell chamber and a catholyte cell chamber which are separated by a CEM membrane, and the anode of the anolyte cell chamber and the cathode of the catholyte cell chamber are connected with the positive electrode and the negative electrode of a power source of the electrolysis device respectively; anolyte obtained by pretreating raw water and prepared catholyte are introduced into the anolyte tank chamber and the catholyte tank chamber respectively, the anolyte is mainly composed of an AXBO4 solution, and the catholyte is an AOH solution; ayHBO4 crystals are produced in the anolyte tank chamber along with the operation of the electrolytic cell, and hydrogen and an AOH solution with increased concentration are produced in the catholyte tank chamber;