The invention provides an unmanned intelligent material cutting device and an unmanned intelligent material cutting method. The unmanned intelligent material cutting device comprises a movable cart, a trolley, a cutting gun, a dust removal system and a detecting probe, wherein the moving direction of the cart is a Y direction; the trolley can move in an X direction relative to the cart and is arranged on the cart; the X direction is perpendicular to the Y direction; the cutting gun is arranged on the trolley in a vertically movable manner; the dust removal system is connected with a dust removal cover and performs ventilating and dust removal on a cutting area; the detecting probe is arranged on the trolley. The unmanned intelligent material cutting device is adopted in the cutting device. The unmanned intelligent material cutting device and the unmanned intelligent material cutting method are environment-friendly, high in efficiency, stable, intelligent, and particularly suitable for cutting large-scale lath-shaped waste steel.