The present invention relates to an outer wall climbing robot for maintenance of an outer wall of a building. An outer wall climbing robot according to the present invention comprises: a robot main body; A pair of first sliding units that are slidable along a pair of first guide rails facing each other on an outer wall of a building along a first direction that is either a vertical direction or a lateral direction of the building outer wall; A pair of first link units connecting the first sliding unit and the robot body, respectively; A pair of second sliding units slidable along a pair of second guide rails formed along a second direction intersecting with the first direction so as to face each other on the outer wall of the building, Wherein the outer wall of the building has a curtain wall structure formed by installing a plurality of unit curtain wall units; Each unit curtain wall unit includes a pair of first unit guide rails formed to face each other and along a first direction and each unit curtain wall unit includes a pair of second unit guide rails facing each other and formed along a second direction A pair of first unit guide rails adjacent to each other are spaced apart from each other, a pair of second unit guide rails adjacent to each other are spaced apart from each other, and the first sliding unit includes a pair of second unit guide rails And the second sliding unit moves through the spacing space between the pair of first unit guide rails adjacent to each other in the first direction through the space between the unit curtain wall units adjacent to each other in the second direction, And moves between the units. Accordingly, it is possible to adapt to the outer walls of various buildings, and in addition, it is possible to maintain the outer wall of the building in cooperation with the design of the curtain wall forming the outer wall of the building so as to significantly reduce the problem of safety accident such as falling An unmanned outer wall climbing robot is provided.
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