Anti-blocking deep venous catheter

The anti-blocking deep venous catheter comprises an outer tube, the right side of an inner cavity of the outer tube is movably connected with a first infusion tube, and the left side of the inner cavity of the outer tube is movably connected with a second infusion tube. The first infusion tube and the second infusion tube are used for conveying liquid medicine to veins of a patient, the connecting tube is used for conveying liquid to inner cavities of the first liquid bag and the second liquid bag, the first liquid bag and the second liquid bag are expanded conveniently, and the first infusion tube and the second infusion tube are blocked through the first liquid bag and the second liquid bag. The switch unit is used for controlling the connection tube to be opened or closed, and the problems that due to the fact that the deep venous catheter is too long, when liquid is not infused, the blood in the catheter is prone to being coagulated, thrombus is generated, and the catheter cannot be used for infusion are