The invention discloses an assisted teaching device for a cardiac interventional operation. The device comprises a fixed device, a near infrared scanning device, an information processing device, a display device and an extracorporeal circulation device; the fixed device comprises a fixed bracket and a distance adjusting device; the near infrared scanning device comprises a tower crane, a near infrared laser emitter and a near infrared laser receiver, and a motor is arranged in the tower crane; the information processing device is used for processing and converting scanning information into aDSA image; the display device is used for displaying and simulating the DSA image; and the extracorporeal circulation device comprises an atrium dextrum catheter, a ventriculus dexter catheter, an atrium sinistrum catheter, a ventriculus sinister and a pump. By utilizing the imaging of the near infrared light, the DSA imaging can be simulated through computer software synthesis, thereby avoiding unnecessary radiation damage of an exerciser in the operation exercise process; and the human body cardiac blood flow process can be simulated by utilizing the extracorporeal circulation device, so that the operation exercise becomes more realistic, and the teaching quality and level are improved.