Multifunctional bag capable of placing drainage bag of abdominal cavity drainage tube of patient inside and going out

The utility model is applicable to the technical field of drainage bags, and provides a multifunctional bag capable of placing an abdominal cavity drainage tube and a drainage bag of a patient inside and outside, the multifunctional bag comprises a drainage bag main body and a fixing band, and the top of the drainage bag main body is fixedly communicated with a threaded tube. When the drainage bag is used and the drainage bag body is damaged, the child buckle and the mother buckle are opened, the valve is closed, the threaded sleeve is rotated, the threaded sleeve rotates to be separated from the threaded pipe, then the cannula can be taken out, then the drainage bag body is replaced, the threaded sleeve is rotated to be fixed to the threaded pipe, and then the child buckle and the mother buckle are fixed. The drainage bag body can be fixed and replaced at the moment, the connecting shell can replace the drainage bag body to work in a short time, inconvenience caused after the drainage bag body is damaged can