The invention discloses a multifunctional operation ladder which comprises a pair of ladder posts, wherein non-slip mats are respectively mounted at the two ends of each ladder post, and each of the left ladder post and the right ladder post is formed by connecting four joint segments with equal length through joint locks; hollow ladder braces are uniformly distributed on each segment of ladder post on one side, and solid ladder braces capable of being inserted into the hollow ladder braces are respectively arranged on each segment of ladder post on the other side; a lockhole and a lockpin, which are corresponding, are arranged at the connecting position of each hollow ladder brace and each solid ladder brace. The butted ladder braces and three joint segments are respectively arranged on the left ladder post and the right ladder post, so that the multifunctional operation ladder can be longitudinally folded and also can be transversely expanded during operation, and can be used as a straight ladder and also can be used as a herringbone ladder, an L ladder or a working platform.