The invention discloses an earthquake-proof self-help escaping stairway of a building. The earthquake-proof self-help escaping stairway comprises a plurality of stairway platforms. Every two adjacent stairway platforms are connected through a stairway board, a center strut perpendicular to the horizontal face is arranged between every two stairway boards, a boss is arranged in the middle of the bottom face of each stairway board, a corbel is arranged at the bottom of each boss, each corbel is connected with the corresponding center strut, a plurality of pedals protruding out of each center strut are evenly arranged on the two sides of the corresponding center strut, a buffering rubber pad is installed between each corbel and the corresponding boss, a reserved hole is formed in the middle of each stairway board, an embedded post is installed in each reserved hole, the lower end of each embedded post is connected to the corresponding corbel, and each reserved hole is filled with concrete. The earthquake-proof self-help escaping stairway has the advantages that the earthquake-proof strength of the stairway of the building can be effectively increased, a precious escaping and rescuing channel is reserved for people in the earthquake process and after an earthquake occurs, even though on the circumstance that a part or all of the stair boards collapse, trapped people can escape the building by themselves, and the number of casualties in an earthquake disaster is reduced.