The invention discloses a flushing and dish-washing powder adding device of a dish-washing machine. The device comprises a dish-washing powder box, an auxiliary spraying arm, a bottom spraying arm andan electromagnetic shunt valve, wherein the auxiliary spraying arm and the bottom spraying arm are connected to the electromagnetic shunt valve, and the quantities and times of water flows entering the two spraying arms are controlled by virtue of the electromagnetic shunt valve; a water inlet and a water outlet are kept in the dish-washing powder box; the dish-washing powder box is fixed relative to the auxiliary spraying arm and the water inlet in the dish-washing powder box is opposite to a dish-washing powder flushing hole in the auxiliary spraying arm, so that water, which is jetted fromthe dish-washing powder flushing hole in the auxiliary spraying arm, enters an inner cavity of the dish-washing powder box from the material inlet in the dish-washing powder box; and washing jet holes are additionally kept in the auxiliary spraying arm. According to the flushing and dish-washing powder adding device of the dish-washing machine provided by the invention, the quantities and the times of the water flows, which enter the auxiliary spraying arm and the bottom spraying arm, are controlled by virtue of the electromagnetic shunt valve, so that the time of a water flow entering the dish-washing powder box is controlled; and the device is simple in structure and low in cost, and a relatively good washing effect can be achieved.