An external-applied tourniquet includes a base material, a protective film, and a porous-material layer located between said base material and said protective film Said porous-material layer, by absorbing water, generates a pressure, such that it can be utilized to absorb blood or bodily fluid of a wound to provide a pressure to suppress said wound from bleeding.一種止血外敷帶,係包括基材、保護膜、及設於該基材與保護膜間的多孔性發泡層,該多孔性發泡層係用於吸水膨脹以產生一壓力,利用多孔性發泡層可吸附傷口處的血液或體液而膨脹,藉此產生壓力施予傷口處以發揮止血作用。1‧‧‧止血外敷帶11‧‧‧基材111‧‧‧敷蓋面12‧‧‧多孔性發泡層13‧‧‧保護膜