A water disposer water groove capable of preventing overflowing comprises an outer shell, a floating ball, a connecting rod, an indicative board, an iron wire net and a blow-down switch, wherein one end of the connecting rod is connected with the floating ball, the other end of the connecting rod is connected with the indicative board, the lower part of the indicative board is supported by a supporting board, the upper part of the indicative board is in contact with a pulley, the sliding of the indicative board is convenient, the front half part of the indicative board is white, the back half part of the indicative board is red, the iron wire net is fixedly arranged inside the water groove and plays the role in restraining the floating ball at the back part of the water groove, a vertical gap is formed in the middle of the iron wire net, the width of the vertical gap is slightly greater than the diameter of the connecting rod, and the connecting rod penetrates through the vertical gap and is capable of moving up and down. When water goes up in the water groove, the floating ball also goes up under the effect of a floating force, the connecting rod is pushed to move, the connecting rod pushes the indicative board to move forward, when the red color at the back half part of the indicative board is exposed, the water groove is indicated to be full of water, and the blow-down switch is opened and directly discharges the water out.