Novel medical drainage bag

The utility model discloses a novel medical drainage bag comprising a bag body and two expanding support rods in the same shapes. The bag body is rectangular at a natural state and contains a sealed bag cavity; the front part and back part of the bag body are respectively provided with two sleeve rings; two sleeve rings on the same plane are left-right symmetrically arranged on the upper-middle part of the bag body; two sleeve rings on the front part are front-back symmetric to two sleeve rings on the back part; each expanding support rod is C-shaped; two ends of each expanding C-shaped support rod are respectively provided with an insertion end matched with the sleeve ring; and each insertion end is provided with a sleeve ring seat spacing the sleeve ring. The expanding support rods can be fastened on two sides of the bag body as needed; with bag body shape change, bag body capacity is increased and drainage bag exchange can be avoided, so medical caring efficiency is improved; drainage bag utilization rate is increased and material waste is reduced; and the novel medical drainage bag is simply structured with convenient operation; and the expanding support rods can be reused, so the novel medical drainage bag possesses obvious practicality.