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The utility model provides a built-in counter weight aerator which comprises an air chamber, a supporting aeration pipe and a built-in counter weight pipe, the two ends of the supporting aeration pipe are respectively communicated with the air chamber, the two ends of the air chamber are sealed through end cover plugs, the built-in counter weight pipe is arranged in the air chamber through the end cover plugs, and the built-in counter weight pipe is arranged in the air chamber. The diameter of the built-in counter weight pipe is smaller than that of the inner wall of the air chamber, an air inlet channel is formed between the built-in counter weight pipe and the inner wall of the periphery of the air chamber, the two ends of the supporting aeration pipe are communicated with the air inlet channels of the air chambers at the two ends respectively, a counter weight mounting sleeve is arranged on the side, located in the air chamber, of the end cover plug, and the axis of the counter weight mounting sleeve coincides with the axis of the air chamber. The two ends of the built-in counterweight pipe are arranged in the air chamber through counterweight mounting sleeves respectively. According to the technical scheme of the utility model, the structure is simple, the counterweight effect is good, the occupied area and the volume of the aerator cannot be increased due to the built-in counterweight, the arrangement density of the aerator cannot be influenced, the use and maintenance cost is low, and the aerator is suitable for popularization and application in aeration devices.