A portable multifunctional coffee extracting device and its application are provided. The extracting device includes an outer container (1) and an inner container (2). The inner container (2) is set in the outer container (1). The outer container (1) is movably sleeved with the inner container (2). The outer container (1) has a closed bottom surface (3). There is an extract holding chamber (4) at the bottom of the inner container (2). A retaining piece (7) or porous baffle plate is set in the bottom surface of the extract holding chamber (4). A filter screen cover (5) is set in the bottom surface of the inner container (2). There is a mechanical sealing device (8) between the side wall of the outer container (1) and the side wall of the inner container (2). The extracting device can be used for extracting or filtering multiple kinds of beverage such as coffee, tea and drinking water.
