The invention belongs to the technical field of heart auxiliary equipment, and discloses a percutaneous interventional left ventricle auxiliary device, which comprises a drainage tube, a return tube,a first catheter, a second catheter and a blood pump. The return tube is connected to the outer side of the drainage tube in a sleeving mode, and a cavity is formed between the return tube and the drainage tube. A plurality of groups of second through holes are formed in the tube wall of the return tube; and one end of the first catheter and one end of the second catheter are both nested in one end tube of the drainage tube. The auxiliary device is simple in structure and low in cost. By using the auxiliary device, thoracotomy and open-heart operations do not need to be performed on a patient,and the pain of the patient is reduced; in addition, treatment operation steps are reduced, the treatment time is saved, the treatment difficulty is reduced, and the treatment reliability is improved.