A liquid absorption bag is suitable for being installed in a discharge part. The discharge part has a discharge port. The liquid absorption bag includes a liquid collection bag and an absorption pad. The liquid collection bag defines a liquid accommodating space, and an opening communicating with the liquid accommodating space and allowing the discharge part to enter the liquid accommodating space. The absorption pad is disposed in the liquid accommodating space, and includes an absorption sheet body having a folding portion disposed at an end of the liquid collection bag away from the opening, the folding portion being substantially parallel along a plurality of strips The fold line is folded and can be stretched or compressed along a length direction perpendicular to the fold line.一種液體吸收袋，適用於裝設於一排泄部，該排泄部具有一排泄口，該液體吸收袋包含一液體收集袋及一吸收墊片。該液體收集袋界定出一液體容置空間，及一連通該液體容置空間並供該排泄部進入該液體容置空間的開口。該吸收墊片設置於該液體容置空間內，並包括一吸收片體，該吸收片體具有一設於該液體收集袋遠離該開口的一端的折疊部，該折疊部沿多條概呈平行的摺線折疊而能沿一垂直於該等摺線的長度方向伸展或壓縮。
