Additive feeding device and washing machine

An additive feeding device, comprising a water supply pipeline, wherein the water supply pipeline is provided with a rising convex part for increasing a height of a water path in a fed water stream direction, and the water supply pipeline on an upstream of the rising convex part is connected with a liquid storage box through a suction structure, and an additive pumped by the suction structure into the water supply pipeline flows to an upstream of the water supply pipeline in a countercurrent mode under a blocking action of the rising convex part;

• a liquid storage cavity is connected to the water supply pipeline in series, the liquid storage cavity is located on the water supply pipeline on an upstream of a position where the liquid storage cavity is connected with the suction structure, and the additive flowing in the countercurrent mode enters the liquid storage cavity to be temporarily stored under an action of the rising convex part;
• and
• a liquid pumping structure is connected with a middle part of a second water supply pipe section, and each of the upstream and the downstream of a connecting position is provided with at least one rising convex part, a first rising convex part on the upstream of the connecting position causes the upstream pipeline to be lower than the connecting position, and a second rising convex part on the downstream of the connecting position causes the downstream pipeline to be higher than the connecting position.