Negative pressure drainage device for breast surgery

The invention discloses a negative pressure drainage device for breast surgery. The device comprises a shell I and a shell II, both the left side and the right side of the shell I are provided with through holes and are fixedly connected to a one-way valve I and a one-way valve II respectively through the through holes, the inner wall of the shell I is slidably connected to a piston, the left sideof the shell II is provided with a through hole and is fixedly connected to the surface, close to the right side, of the one-way valve II through the through hole in a sealing way, and the upper surface of the shell II is fixedly connected to a double-shaft motor. According to the invention, the matching use of the structures solves the problems that: in the practical use process, traditional negative pressure devices can hardly provide a stable negative pressure environment for tissue fluid, once the tissue fluid drainage is too high, the drainage effect is poor, the drainage efficiency is reduced, the backflow phen