An auto-splicing device for an electrode, comprising: an electrode supply unit ; a first electrode conveying unit comprising a first unwinding unit which is configured to unwind a first electrode (A1); a first conveying unit which is configured to convey the unwound first electrode (A1); and a first splicing unit which is configured to connect a second electrode (A2) to the first electrode (A1) when unwinding of the conveyed first electrode (A1) is completed; and a second electrode conveying unit comprising a second unwinding unit which is configured to unwind the second electrode (A2); a second conveying unit which is configured to convey the unwound second electrode (A2); and a second splicing unit which is configured to connect the second electrode (A2) to the first electrode (A1), the first splicing unit or the second splicing unit comprises a first Edge Position Control sensor and a second Edge Position Control sensor facing side surfaces of the first electrode (A1) or the second electrode (A2), characterized in that : the first Edge Position Control sensor and the second Edge Position Control sensor face the same direction to sense one electrode surface of the first electrode (A1) and one electrode surface of the second electrode (A2) located on the same plane when the first electrode (A1) and the second electrode (A2) are connected, and the first Edge Position Control sensor is configured to sense a coating line (I) formed on one electrode surface of the first electrode, and the second Edge Position Control sensor is configured to sense a coating line (I) formed on one electrode surface of the second electrode. an electrode supply unit ; a first electrode conveying unit comprising a first unwinding unit which is configured to unwind a first electrode (A1); a first conveying unit which is configured to convey the unwound first electrode (A1); and a first splicing unit which is configured to connect a second electrode (A2) to the first electrode (A1) when unwinding of the conveyed first electrode (A1) is completed; and a second electrode conveying unit comprising a second unwinding unit which is configured to unwind the second electrode (A2); a second conveying unit which is configured to convey the unwound second electrode (A2); and a second splicing unit which is configured to connect the second electrode (A2) to the first electrode (A1), the first splicing unit or the second splicing unit comprises a first Edge Position Control sensor and a second Edge Position Control sensor facing side surfaces of the first electrode (A1) or the second electrode (A2), the first Edge Position Control sensor and the second Edge Position Control sensor face the same direction to sense one electrode surface of the first electrode (A1) and one electrode surface of the second electrode (A2) located on the same plane when the first electrode (A1) and the second electrode (A2) are connected, and the first Edge Position Control sensor is configured to sense a coating line (I) formed on one electrode surface of the first electrode, and the second Edge Position Control sensor is configured to sense a coating line (I) formed on one electrode surface of the second electrode. <EOS>