Washing liquid box, water box and washing machine

The invention provides a washing liquid box, a water box and a washing machine. The washing liquid box comprises a washing liquid box body, a liquid discharge channel is constructed on the washing liquid box body, in the washing liquid discharge direction, a first hole with a first diameter and a second hole with a second diameter are formed in the liquid discharge channel sequentially, the firstdiameter is larger than the second diameter, a seal ring is arranged in the first hole and located at the opening of the second hole, the washing liquid box also comprises a valve element, the valveelement is located in the first hole and can reciprocate in the washing liquid discharge direction, and when the valve element moves in the washing liquid discharge direction, the valve element and the seal ring form linear seal. According to the washing liquid box, the water box and the washing machine, the contact surface of a seal disc and the seal ring form linear seal, the seal pressure is improved, and the seal effect