Disclosed are a washing additive box and washing machine. The washing additive box comprises a box body (1), which is a closed box (1) with a hollow chamber inside, the box body (1) is provided with a liquid outlet (12), the liquid outlet (12) is used for connecting a distribution tube of a washing machine so as to distribute washing additive in a washing chamber of the washing machine; a one-way breathable structure for balancing air pressure inside and outside the washing additive box; a liquid output device provided at the liquid outlet (12),wherein the washing additive placed in a cavity inside the box body (1), enters the distribution tube of the washing machine from the washing additive box by means of the liquid output device. Air flows one way in the washing additive box, and the air pressure of the washing additive box can be balanced, so as to make drawing out the washing additive smoother and the difficulty of drawing out the washing additive not increased as the pressure inside the washing additiv
