A washing additive automatic delivery device for a washing machine, comprising a container for accommodating washing additive; a mounting part for holding the container , wherein the container is arranged in the mounting part in a removable manner; and at least one group of a liquid level detection structure configured to detect liquid level in the container ; wherein the liquid level detection structure comprises a detection part , a conducting part connected with a circuit, and a fixed part , characterized in that one end of the detection part is inserted into the container in a sealed manner, and another end of the detection part is in contact with the conducting part to conduct the circuit when the container is placed in the mounting part , and is separated from the conducting part to disconnect the circuit when the container is taken out from the mounting part ; said one end of the detection part is inserted into the container in a detachable and sealed manner from a bottom of the container through the fixed part , the fixed part is manufactured from insulating materials, at least a part of the fixed part is inserted into the container , and a height from a top end of the fixed part to the bottom of the container is a measurable lowest liquid level; wherein the detection part is wrapped in the fixed part in a sealed manner, the first end and a second end of the detection part both extend out of the fixed part ; and wherein the liquid level detection structure comprises two detection parts , wherein if washing additive in the container is in contact with each of the two detection parts , the two detection parts are conducted through the washing additive, the liquid level detection structure forms a circuit pathway, and sufficient washing additive is detected; otherwise, if the washing additive in the container is not in contact with the two detection parts , the circuit between the two detection parts is disconnected, and the liquid level is low, the washing additive is needed to be supplemented. a container for accommodating washing additive; a mounting part for holding the container , wherein the container is arranged in the mounting part in a removable manner; and at least one group of a liquid level detection structure configured to detect liquid level in the container ; wherein the liquid level detection structure comprises a detection part , a conducting part connected with a circuit, and a fixed part , characterized in that one end of the detection part is inserted into the container in a sealed manner, and another end of the detection part is in contact with the conducting part to conduct the circuit when the container is placed in the mounting part , and is separated from the conducting part to disconnect the circuit when the container is taken out from the mounting part ; said one end of the detection part is inserted into the container in a detachable and sealed manner from a bottom of the container through the fixed part , the fixed part is manufactured from insulating materials, at least a part of the fixed part is inserted into the container , and a height from a top end of the fixed part to the bottom of the container is a measurable lowest liquid level; wherein the detection part is wrapped in the fixed part in a sealed manner, the first end and a second end of the detection part both extend out of the fixed part ; and wherein the liquid level detection structure comprises two detection parts , wherein if washing additive in the container is in contact with each of the two detection parts , the two detection parts are conducted through the washing additive, the liquid level detection structure forms a circuit pathway, and sufficient washing additive is detected; otherwise, if the washing additive in the container is not in contact with the two detection parts , the circuit between the two detection parts is disconnected, and the liquid level is low, the washing additive is needed to be supplemented. <EOS>