The invention discloses a using method of a digital crystallizer-free specially-shaped blank continuous casting device, and belongs to the technical field of continuous casting production of the metallurgical industry. The digital crystallizer-free specially-shaped blank continuous casting device comprises a tundish, an immersion type water gap and a blank shell generating mechanism connected with a computer, wherein the blank shell generating mechanism is used for surfacing a blank shell around the outlet of the immersion type water gap. The blank shell generating mechanism comprises mechanical arms, welding heads, metal wires and metal wire rings, wherein the welding heads are positioned at the free ends of the mechanical arms; the mechanical arms are arranged around the outlet of the immersion type water gap; the metal wires are wound on rotatable metal wire rings; and extending-out ends of the metal wires are connected with the welding heads. The digital crystallizer-free specially-shaped blank continuous casting device can be used for producing specially-shaped blanks with irregular section dimensions, so that the industrial large-scale low-cost production advantages of a conventional process are brought into play, and the new technical characteristics of digitization and intelligentization of a new area are achieved, and therefore, a near-net-shape continuous casting technology is achieved.