NOVELTY - A hydrogen-oxygen electrolyzing device (1) comprises a container (41) providing receiving trough (413) for containing electrolyte; and an electrolyzing structure; first conductor and second conductor electrically connect with two outermost ones of the electrodes; where each of the electrodes is carbon paper electrode with material changed outer surfaces, and further comprises carbon paper substrate having first surface and second surface; first metal layer is joined to first surface; and second metal layer is joined to second surface.    USE - As a hydrogen-oxygen electrolyzing device for generating hydrogen and oxygen with electrolytic solution.    ADVANTAGE - The hydrogen-oxygen electrolyzing device with the carbon paper electrodes having two material changed outer surfaces respectively in which the carbon paper substrates are utilized as the electrodes due to having good properties such as the electrical conductivity, thermal conductivity, the porosity, the permeability, the hydrophicity and the hydrophobility such that the surface contacts between the water molecules and the electrodes are maximized to prevent the accumulation of the produced gases and to even the currents of the electrodes for enhancing the electrolyzing efficiency. The hydrogen-oxygen electrolyzing device with which the supplementary electrolyte can be added automatically with the flames being prohibited to move along with the mixture of hydrogen and oxygen and ignite the mixture of hydrogen and oxygen in the receiving trough, and the operation of the electrolysis can be stopped producing the mixture of hydrogen and oxygen automatically at the time of the pressure of the mixture of hydrogen and oxygen exceeding the preset pressure.    DETAILED DESCRIPTION - A hydrogen-oxygen electrolyzing device (1) for generating hydrogen and oxygen with electrolytic solution comprises a container (41) providing receiving trough (413) for containing the electrolyte; and at least an electrolyzing structure (2); where the electrolyzing structure further comprises at least a serial cell is disposed in the receiving trough and further comprising electrodes with a gap between every two neighboring ones of the electrodes; a first conductor (21); and a second conductor (22); where the first conductor and the second conductor electrically connect with the two outermost ones of the electrodes; where each of the electrodes is a carbon paper electrode with material changed outer surfaces, and further comprises a carbon paper substrate having a first surface and a second surface; a first metal layer is joined to the first surface; and a second metal layer is joined to the second surface. An INDEPENDENT CLAIM is included for carbon paper electrode with both outer surfaces is changed in material for a hydrogen-oxygen electrolyzing device is capable of producing hydrogen and oxygen comprising a carbon paper substrate having a first surface and a second surface is disposed oppositely to each other; a first metal layer is joined to the first surface; and a second metal layer being joined to the second surface.    DESCRIPTION OF DRAWING(S) - The figure shows a plan view of hydrogen-oxygen electrolyzing device.    Hydrogen-oxygen electrolyzing device (1)    Electrolyzing structure (2)    First conductor (21)    Second conductor (22)    Container (41)    Trough (413)