Abstract: A water filtering device includes a filter bag and an outer bag. The filter bag is internally provided with a first and a second filter unit. The first filter unit is connected at upper ends to a top opening of the filter bag to form a lower folded section and define a first water filtering space in the filter bag. The second filter unit is fixedly connected to a water outlet on a bottom of the filter bag and defines a second water filtering space in the filter bag. A filter material is provided in the second water filtering space. The outer bag covers the filter bag, such that a water storing space is formed between the outer bag and the filter bag. The water filtering device is conveniently portable and saves any assembling procedure, and can effectively filter water and store the filtered water.