Multifunctional lake coastal stepped drop wetland system and operation method

The invention discloses a multifunctional lake coastal stepped drop wetland system and an operation method. The multifunctional lake coastal stepped drop wetland system comprises a balanced water replenishing system, an internal circulation system, a stepped wetland system, a wetland plant system and an operation control system, the stepped wetland system comprises multiple stages of wetland systems with the heights reduced step by step, and water needing to be purified flows down step by step and flows through each stage of wetland system. Each stage of wetland system comprises a water distribution system, a wetland filter bed system and a water outlet system. The balance water supplementing system ensures the stability of lake water. According to the invention, through the construction of the multifunctional lake coastal stepped drop wetland system, ecological water supplementation, surrounding rainwater and lake water circulation and purification promotion are realized by utilizing a lake coastal space, an