A constructed wetland for use in the circulating purification of a landscape water body, the same being an alternate-type constructed wetland of a combination of a pond-type constructed wetland and a bed-type constructed wetland; the pond-type constructed wetland is provided with a gravel layer having a particle size of 50-80mm, submerged plants and floating plants in sequence from a pond bottom to a pond surface; the bed-type constructed wetland is provided, in sequence from a pond bottom to a pond surface, with a lower layer water collection perforated pipe, a gravel layer having a particle size of 20-40mm, a microbial filler layer having a particle size of 10-20mm, a coarse sand layer having a particle size of 0-5mm, an upper layer water distribution perforated pipe and an emerging plant layer; a water outlet end of the pond-type constructed wetland is connected to the upper layer water distribution perforated pipe of the bed-type constructed wetland, while the lower layer water collection perforated pipe of the bed-type constructed wetland is connected to a water inlet end of a landscape water body. The use of such a constructed wetland overcomes the problems such as high costs and operation expenses and the creation of secondary pollution which exist with the methods used by a landscape water body of water division and water exchange, coagulation and sedimentation, and the addition of a microbial strain, thereby achieving the ecological restoration of a polluted water body; the present invention is suitable for long-term water quality improvement and maintenance of a landscape water body.
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