Abstract: A decanting device including a shell body, a switch, a pump body and a telescopic rod. The switch is electrically connected to the pump body. The pump body is arranged in the shell body and extends outward the shell body with a gas blowing port. The upper end of the telescopic rod is movably connected to the gas blowing port, and the lower end is provided with a plugging cover. The telescopic rod is hollowly arranged. A plurality of gas vent groups are arranged on the peripheral wall of the telescopic rod from bottom to top alternately, and each gas vent group includes gas outlet vents spaced along the circumferential direction. The gas outlet vent communicates with the gas blowing port of the pump body through the telescopic rod. The diameter of the gas outlet vent of the adjacent gas vent groups is reduced from bottom to top.