Blood purification circulation pipeline

The utility model discloses a blood purification circulation pipeline which comprises a blood output pipe, a first peristaltic pump is arranged on one side of the blood output pipe, a first guide pipe is installed on one side of the first peristaltic pump, and a blood backflow pipe is installed at the bottom end of a replacement liquid injection cavity. And an automatic anticoagulant supplementing mechanism is arranged at the top end of the anticoagulant injection cavity. The blood purification circulation pipeline is provided with a second peristaltic pump, an anticoagulant extraction pipe, an anticoagulant injection pipe and an anticoagulant medicine bottle, when the blood purification circulation pipeline is used, a first external clamping type miniature flow meter keeps monitoring the blood flow in a first guide pipe, a first programmable logic controller controls the second peristaltic pump to operate, an anticoagulant in the anticoagulant medicine bottle is extracted, and the anticoagulant in the antico