The utility model discloses a novel dual -purpose construction of light is with ladder, it comprises (2) two benchs of last ladder (1) and descending stair, goes up ladder (1) and descending stair (2)and adopts the design of isometric bench, connects through hinge (6) between the two to can wind hinge (6) between the two forms chevron shape ladder or style of calligraphy ladder at 0~180 within range rotary combined, going up at last ladder (1) and being equipped with one dead lever (4) with the position of descending stair (2) contact, this dead lever (4) are arranged in dead slot (9) of ladder (1), and spout (3) well realization and the sliding connections of last ladder (1) of fixed protruding ball (8) card that sets up on last terraced (1) shell is gone up through it in this dead lever(4). The utility model discloses can constitute style of calligraphy ladder or chevron shape ladder with stair in a flexible way to the preparation is simple and easy, and weight is lighter, and on -the -spot construction convenience can improve construction operating efficiency to a certain extent.