NOVELTY - A reoxygenation tidal flow artificial wetland system comprises substrate, wetland plant, water collecting pipe, wetland respirator, water outlet and water inlet systems, and automatic control system. The substrate has three layers, which is prepared by thick, middle and thin particles from bottom to top. An overflow groove is formed at upper part of substrate. The wetland plant is plant with strong root and suitable for local climate. The wetland respirator comprises pipes where pores are formed on two cross pipes, which are respectively put in different depths of the substrate.    USE - Reoxygenation tidal flow artificial wetland system used in purifying sewage.    ADVANTAGE - The artificial wetland system can control water feed and water discharge, and reaction by analogizing the tidal flow so as to purify sewage. The reoxygenation ability is strong which is enhanced by the wetland respirator to greatly improve processing efficiency of ammonia nitrogen. The water collecting and distributing system is simple, which reduces the cost of the artificial wetland system. The whole process is automatically controlled with very simple operation and management.    DETAILED DESCRIPTION - A reoxygenation tidal flow artificial wetland system comprises substrate, wetland plant, water collecting pipe, wetland respirator, water outlet and water inlet systems, and automatic control system. The substrate has three layers, which is prepared by thick, middle and thin particles from bottom to top; and has total thickness of 0.8-1.2 m. An overflow groove is formed at upper part of the substrate. The wetland plant is plant with strong root and suitable for local climate. The wetland respirator comprises pipes in the shape of a Chinese character TU, where pores are formed on two cross pipes, which are respectively put in different depths of the substrate. A vertical pipe is connected with the two cross pipes. An opening at upper end of the vertical pipe is higher than the substrate and is exposed in the air. The water outlet and inlet systems are integrated and share one water pipe net. The pipe net is located in the substrate at bottom of pond; and is connected by cross pipe and vertical pipe connected with a water inlet pipe and a water outlet pipe. A pore is drilled on the pipe. The automatic control system comprises a solenoid valve, a programmable logic controller, a liquid level meter, and a time relay.