There is disclosed a structure of a railing on the roof of a building in which a railing made of iron is installed as an aid to the railing wall provided on the roof of a building. Vertical iron beams respectively inserted in a vertical direction into a plurality of vertical insertion grooves provided along the railing wall on the upper surface of the railing wall; The vertical steel beam Auxiliary railing rods having both ends horizontally installed on the inner side of the two vertical iron beams; A main railing rod having both ends horizontally installed on the side of the vertical iron beam and positioned between two vertical iron beams not connected by an auxiliary railing rod; An insertion rod formed on the inner side of the railing wall and inserted into a horizontal insertion groove that meets the vertical insertion groove and the inside of the railing wall, coupled to a horizontal coupling groove provided on the inner surface of the lower end of the vertical iron beam, and coupled to the horizontal coupling groove, A cross support formed by combining four portions of an upper vertical bar that is in close contact with the railing wall in a vertical direction, a lower vertical bar that is in close contact with the lower end of the railing wall, and a locking bar that is formed horizontally in the inner direction of the roof, such as the upper vertical bar; A first horizontal rod having a plurality of both side ends coupled in a horizontal direction between the locking rods constituting the cross support to function as a chair; In addition, a plurality of both side ends are coupled to the upper vertical bar constituting the cross support to provide a rooftop railing wall structure of a second horizontal rod serving as a backrest.
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