Drainage equipment for cardiology department and capable of avoiding backflow of drainage object

The invention relates to a drainage equipment for cardiology department and capable of avoiding backflow of a drainage object, which comprises a drainage bottle, an upper end of the drainage bottle is opened, a bottle cap is arranged at the upper end opening of the drainage bottle, a lower end face of the bottle cap makes contact with the upper end face of the drainage bottle to form sealing, an air outlet control mechanism is arranged on the upper portion of the bottle cap, a negative pressure generating device connected with the side face of the bottle cap through a drainage tube, the drainage tube is communicated with the interior of the drainage bottle, the liquid inlet tube is connected with the negative pressure generating device, the liquid inlet control mechanism is arranged in the liquid inlet tube, and the liquid outlet control mechanism is arranged at the bottom of the drainage bottle. The drainage equipment is reasonable in design, the negative pressure generating device works to generate negative pressure, air in the bottle is discharged from the air outlet control mechanism, drainage objects are sucked into the drainage bottle from the liquid inlet pipe, and under the dual effects of the air outlet control mechanism and the liquid inlet control mechanism, backflow of the drainage objects is avoided; while samping, drainage objects are controlled to flow into the sampling test tube from the bottom of the drainage bottle through the liquid outlet control mechanism, and sampling is convenient.