Method for designing annular tube type electrolytic cell

The invention relates to a water electrolysis oxyhydrogen generating device, in particular to a method for designing annular tube type electrolytic cell. The method for designing an annular tube type electrolytic cell is characterized in that: the annular tube type electrolytic cell is formed by sequentially sleeving 2 to 8 tubular electrodes (4) which have different tube diameters and are arranged between a tubular anode (2) and a tubular cathode (8) equidistantly; the tubular cathode (8) is an annular barrel formed by concentrically sleeving two steel tubes with different diameters and the same height and welding the bottom with an annular cathode tube bottom (13); and the tubular anode (2) is concentrically sleeved on the middle position between the inner steel tube and the outer steel tube of the tubular cathode (8). The annular tube type electrolytic cell has the characteristics of high antiknock property, small sealing area, high sealing property, insusceptibility to leakage of electrolyte, simple struc