Manhole ladder scaffolding according to the present invention disclosed, the base portion formed by bending a metal bar in a "c"shape; An extension part that is fixed to both ends of the base and is located in a hole formed in a manhole, which opens when the base part is pressed and expands so that an end portion is in close contact with the inside of the hole; And a closing portion provided to surround the base portion. According to the present invention, there is an effect of being firmly fixed to the inner circumferential surface of the hole by deformation while being opened by a blow in a state in which an extension part is provided at both ends of the base part and inserted into a hole drilled in the inner wall surface of a manhole.
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