A body fluid sucking device includes a body fluid collecting container, a sucking unit, an air extracting unit, and a filtration member. The sucking unit is coupled with the body fluid collecting container and has a first inner channel interlinked with an inner space of the body fluid collecting container. The air extracting unit is coupled with the body fluid collecting container and includes a second inner channel having a first opening end interlinked with the inner space of the body fluid collecting container, and a second opening end. The filtration member, which covers the first opening end or the second opening end, has a multi-aperture structure with waterproof and air-permeable effects. When air in the body fluid collecting container is extracted out through the air extracting unit, the air and the body fluid are both filtrated by the filtration member which blocks the body fluid (such as water, snot, snivel, spittle, and etc.) but allows the air to pass through, so as to prevent the body fluid from getting into the air extracting unit and resulting in a cross-infection, as well as to prevent the body fluid from getting into an air extracting apparatus (such as an air pump) through the air extracting unit and causing damages to the body fluid sucking device.
