Self-driven construction machinery

The utility model relates to a self-driven construction machinery. The self-driven construction machinery is provided with a rack (1), a base plate (2), devices (10L and 10R) and a control unit (14), wherein the base plate (2) comprises at least one left side walking mechanism (4L) and right side walking mechanism (4R) in the operation direction (A); the devices (10L and 10R) ascend and descend relative to the rack (1) and are placed on the walking mechanisms (4L and 4R) on the ground; the control unit (14) is used for activating a device for lifting the walking mechanisms so as to regulate the heights of the walking mechanisms relative to the rack, and the control unit (14) comprises a device (15) which is used for recognizing the height variation of the surface covered by the walking mechanism relative to the rack. If the ground height variation is detected, the control unit activates the devices (10L and 10R) for lifting the walking mechanisms so as to enable the corresponding left side walking mechanism o