Anti-reflux metering type drainage bag

The utility model relates to an anti-regurgitation metering type drainage bag which comprises a drainage bag body and a sealing cover, a connecting pipe is vertically installed on the sealing cover, one end of the connecting pipe is sequentially communicated with an anti-regurgitation device and a first drainage pipe, a first flow adjusting valve is installed on the first drainage pipe, one end of the first drainage pipe is fixedly communicated with a Luer connector, and the other end of the first drainage pipe is fixedly communicated with a second flow adjusting valve. The anti-reflux device comprises an anti-reflux pipe with openings in the two ends, the two ends of the anti-reflux pipe are connected with the first drainage pipe and the connecting pipe in an inserted mode respectively, an annular baffle coaxial with the anti-reflux pipe is fixedly connected into the anti-reflux pipe, and a sliding rod penetrating through the annular baffle is slidably connected into the annular baffle; the end, close to the