Anti-backflow mechanism and lumbar surgery body fluid collecting bag

The utility model relates to the technical field of lumbar surgery, in particular to an anti-backflow mechanism and a lumbar surgery body fluid collecting bag. The anti-backflow mechanism comprises a liquid storage part and an anti-backflow part, the liquid storage part comprises a liquid storage bag and the anti-backflow part, the anti-backflow part comprises a plurality of liquid guide parts and a drainage part which are located in the liquid storage bag, the liquid guide parts are all fixedly connected to the inner wall of the liquid storage bag, the drainage part is located at the inner bottom of the liquid storage bag, and the drainage part is fixedly connected to the inner wall of the liquid storage bag. Liquid falling everywhere can be concentrated in the liquid inlet holes to fall through the funnel pieces, due to the fact that the multiple liquid inlet holes are designed in a staggered mode, the liquid can be blocked layer by layer when flowing back, the difficulty of liquid backflow is improved, whe