The invention discloses an integrated water purification system for aquaculture water. The integrated water purification system comprises a water inflow cabin arranged in a water tank, a water purifying device, a pollutant discharging device, a functional device and a water draining cabin, wherein the water purifying device is arranged between the water inflow cabin and the water draining cabin and is used for filtering and purifying the to-be-purified water; the functional device is arranged in the water inflow cabin, the water purifying device and the water draining cabin and is used for performing the temperature regulation, sterilization and aeration treatment on the purified water; the pollutant discharging device is arranged at the bottom of the water tank and is used for discharging precipitate impurities; the water tank is arranged as an opening connected water tank; a water pump is arranged on one side of the water draining cabin, and the purified water is discharged through the water draining cabin; the to-be-purified water is discharged into the water inflow cabin; the to-be-purified water is purified by the water purifying device, is subjected to temperature regulation and sterilization through the functional device and then is drained through the water draining cabin; and the precipitates at the bottom of the water tank are controlled and discharged by the pollutant discharging device. According to the invention, a plurality of water treatment devices are integrated in the same purifying tank, so that the construction cost and the maintenance cost can be saved, the management and operation are convenient, and the integrated water purification system is suitable for wide popularization.