Drainage bag with anti-reflux function

The utility model relates to the technical field of medical drainage bag equipment, and discloses a drainage bag with an anti-reflux function, which comprises a drainage bag main body, a first connecting tube is fixedly arranged on one side of the top of the drainage bag main body, and a first sealing connecting cap is fixedly arranged at one end, far away from the drainage bag main body, of the first connecting tube. An anti-backflow cylinder is arranged at the end, away from the first connecting pipe, of the first sealing connecting cap. According to the anti-backflow drainage bag, the anti-backflow cylinder is arranged on the drainage tube, the two sets of one-way valves are arranged in the anti-backflow cylinder, and through the one-way valves, the drainage tube can only pump liquid into the drainage bag from the interior of the human body, and the liquid pumped out of the drainage bag is effectively prevented from flowing back to the human body; therefore, the use risk of the patient is greatly reduced.