Abstract: In order to promote the application value of constructed wetland and build an ecological, harmonious and friendly urban space, a composite vertical-flow modular constructed wetland model was designed and researched, and the index data of ammonia nitrogen, total nitrogen, total phosphorus, COD and DO were monitored through experiments. The experiment results showed that under the low pollution load, the ammonia nitrogen removal rate and total nitrogen removal efficiency of the constructed wetland model can reach 89%~96% and 54%~75%, respectively. The dissolved oxygen concentration is high, but the total phosphorus removal effect is not good because of the filler poor adsorbability.