The invention discloses one-time double-clamp cutting-off clamping forceps which comprise double-clamp structures, double-chuck mechanisms, clamping transmission mechanisms, cutting-off blade and cutting-off transmission mechanisms, rotation mechanisms and fixing handle mechanisms. The one-time double-clamp cutting-off clamping forceps have the advantages that two ends, with certain lengths, of each blood vessel can be accurately fixed and can be simultaneously fastened and closed, and each blood vessel with the two fastened and closed ends can be cut off from the middle; the blood vessels can be prevented from being excessively ligatured or cut, and accordingly injury on healthy tissues of human bodies can be obviously reduced; the blood vessels are fastened and cut off by the same instrument at one step, and procedures in which a surgeon extends ligature forceps into a human body at first, fastens and close two ends of a blood vessel, takes the ligature forceps out of the human body, extends a cutting-off appliance into the human body and cuts off the blood vessel can be omitted; the surgical speeds can be obviously effectively increased, and the surgical risks can be reduced; ligature clips are plastic clips with self-locking inverted fasteners, are firm and reliable and can be prevented from falling off; the ligature clips made of recyclable materials can automatically decompose in the human bodies within 6-8 months.