The invention discloses a built-in ladder-type double-layer stage. The stage comprises a lower-layer steel rack, an upper-layer steel rack and a fixed step, and a lifting step is arranged on the lower-layer steel rack; the lifting step comprises an upper steel rack rod, a lower steel rack rod and multiple step single bodies, and the upper steel rack rod and the lower steel rack rod are parallellyarranged; a fixing base, a lifting rack and a lifting mechanism are arranged in a lower containing port, one end of the upper steel rack rod is hinged to the fixing base, and one end of the lower steel rack rod is hinged to the fixing base; the other end of the upper steel rack rod is hinged to the lifting rack, and the other end of the lower steel rack rod is hinged to the lifting rack. The built-in ladder-type double-layer stage has the advantages that the stage is reasonable in structure, and actors can get on and get off the stage and turn to the stage for acting through an auxiliary mobile structure in the stage; the stage is compact in structure and good in hidden performance; the form and function of a traditional double-layer stage are remained, the new application function is alsoadded, and the acting presentation mode is enriched; the actors can get on and get off the stage consecutively, and the stage turning time of the actors is shortened; arrangement of the program scenes can be more compact; the stage is convenient to use, easy to maintain, safe and reliable.