A collecting device capable of collecting a fluid includes a first absorbing element provided with a first absorption rate and a second absorbing element provided with a second absorption rate similar to the first absorption rate. The second absorbing element disposed on the first absorbing element is connected to the first absorbing element via a port. When the first absorbing element is saturated, the fluid originated from the saturated first absorbing element travels through the port along a single way and absorbed by the second absorbing element.一種收集裝置,可對於一流體進行收集。收集裝置包括一第一吸收元件與一第二吸收元件。第一吸收元件具有一第一吸收率。第二吸收元件係設置於第一吸收元件之上且經由一連接埠而相互連接,並且第二吸收元件具有一第二吸收率,其中,第二吸收元件之第二吸收率近似於或小於第一吸收元件之第一吸收率。當第一吸收元件吸收流體而達到飽合狀態時,源自於第一吸收元件之流體係沿著單一方向而經由連接埠而被第二吸收元件所吸收。1...第一吸收元件2...第二吸收元件3...第三吸收元件B...基底b0...埠件d100...管線d101...管線4...中間元件400...膜件401...連接埠M1...收集裝置S...驅動模組(真空幫浦)W...廢液(流體)