A step apparatus for heavy construction equipment andtree harvester having a leveling system for controlling ahorizontal level of a cab and an upper frame is provided,which includes a step protector including a main bodyfixedly installed on one side of an upper frame, a stepguide hole opened from an inside of the main body to anoutside, a guide rail formed along a length direction of aninner side wall of the main body, a side step including aplurality of foot steps arranged at specified intervals ona step frame to form stairs, a step drawer formed on anupper part of the step frame and seated in the step guidehole, and a guide pin positioned adjacent to the stepdrawer and projected toward the side wall of the main body.
