Postoperative subcutaneous drainage device for thyroid surgery

The invention discloses a postoperative subcutaneous drainage device for thyroid surgery. The postoperative subcutaneous drainage device comprises a drainage tube, a negative pressure drainage ball, a transition drainage tube, a drainage bag, a puncture needle and a skin expander; the drainage tube part of the device is divided into an in-vivo tube section and an in-vitro drainage section, wherein the inner diameter and the outer diameter of the in-vivo tube section are smaller than those of the in-vitro drainage section, and the inner diameter and the outer diameter of the joint of the in-vivo tube section and the in-vitro drainage section are gradually transited and integrally formed and connected; due to the fact that the outer diameter of the built-in in-vivo section is relatively small, the puncture difficulty can be reduced, and the wound surface of a puncture point is relatively small after catheter indwelling succeeds; the inner diameter and the outer diameter of the in-vitro drainage section are rela