The utility model discloses a three-dimensional combined ladder for building construction. The three-dimensional combined ladder is formed by hinged connection of tops of three common ladder bodies and arrangement of a top platform. Each ladder body mainly comprises vertical bars (1) and cross bars (2). In order to guarantee the stable usage of the three-dimensional combined ladder, a soft rope (5) or a pull hook (6) is arranged in the middle of each ladder body to prevent each ladder body from slipping during usage. The three-dimensional combined ladder has the benefits as follows: the ladder is reasonable in structure, convenient to use and safe and reliable in construction.