A stair-climber, comprising: a base; an inclination unit assembly pivotally disposed at said base; an inclination unit regulator disposed between the base and the inclination unit assembly and adapted for adjusting the incline angle of the inclination unit assembly; a step unit disposed at the inclination unit assembly, the step unit comprising a plurality of steps rotatable pivotally relative to the inclination unit assembly; and a step regulator disposed at the inclination unit assembly and connected to the steps of the step unit such that the steps are each oriented at a specific angle relative to the inclination unit assembly; wherein the inclination unit assembly comprising a first inclination unit and a second inclination unit; the first inclination unit having a front end disposed at a front end of the base and slidable forward and backward; the second inclination unit having a bottom surface pivotally connected to a top end of the first inclination unit and having a rear end pivotally connected to a rear end of the base; wherein the step unit further has a step adjustment frame disposed movably at the second inclination unit and having two opposing lateral boards, wherein external lateral sides of the lateral boards are connected to the step regulator, wherein a guide slot is disposed on an inner side of each said lateral board, wherein the step unit has multiple guide rods and multiple guide wheels, with each said guide rod disposed at a corresponding one of the steps, and each said multiple guide wheel disposed at two ends of a corresponding one of the guide rods and rotatably inserted into a corresponding one of the guide slot. a base; an inclination unit assembly pivotally disposed at said base; an inclination unit regulator disposed between the base and the inclination unit assembly and adapted for adjusting the incline angle of the inclination unit assembly; a step unit disposed at the inclination unit assembly, the step unit comprising a plurality of steps rotatable pivotally relative to the inclination unit assembly; and a step regulator disposed at the inclination unit assembly and connected to the steps of the step unit such that the steps are each oriented at a specific angle relative to the inclination unit assembly; wherein the inclination unit assembly comprising a first inclination unit and a second inclination unit; the first inclination unit having a front end disposed at a front end of the base and slidable forward and backward; the second inclination unit having a bottom surface pivotally connected to a top end of the first inclination unit and having a rear end pivotally connected to a rear end of the base; wherein the step unit further has a step adjustment frame disposed movably at the second inclination unit and having two opposing lateral boards, wherein external lateral sides of the lateral boards are connected to the step regulator, wherein a guide slot is disposed on an inner side of each said lateral board, wherein the step unit has multiple guide rods and multiple guide wheels, with each said guide rod disposed at a corresponding one of the steps, and each said multiple guide wheel disposed at two ends of a corresponding one of the guide rods and rotatably inserted into a corresponding one of the guide slot.