Automatic delivery system for a washing machine and washing machine

An automatic delivery system for a washing machine, comprising

• a water box provided with a water outlet configured to be communicated with a washing barrel of a washing machine,
• a main water inlet pipeline and a detergent delivery pipeline,
• a distribution box arranged inside the water box, the distribution box being internally provided with at least one installation cavity for accommodating a washing additive box;
• the washing additive box being installed in the installation cavity,
• the washing additive box being a closed box body with a cavity for accommodating washing additive, and being provided with an unidirectional ventilation structure and a liquid outlet, the liquid outlet being open when the washing additive box is communicated with the detergent delivery pipeline, and the liquid outlet being close when the washing additive box is disconnected with the detergent delivery pipeline;
• and
• a negative pressure extraction mechanism, comprising a Venturi tube arranged in the main water inlet pipeline, the washing additive being drawn out of the washing additive box and delivered into the washing barrel by a negative pressure generated by water flow through an outlet of the Venturi tube.