A multifunctional ecological floating island consists of a seat and a seat. The upper seat includes a bottom wall, a surrounding wall extending upward from the bottom wall, an extending barrel extending downward from the bottom wall, and a plurality of height blocks extending upward from the bottom wall. The surrounding wall has a venting opening. The extension barrel has a main root hole. Each of the padding blocks has a downwardly downward recess, and the padding block and the surrounding wall define an opening space that opens upwardly and communicates with the main root hole. The lower seat is engaged with the upper seat in a first direction, and includes a bearing surface, a guide hole extending from the bearing surface along the axis, and a plurality of mounting blocks extending upward from the lower seat. Each mounting block is aligned with a recess of a respective pad. The height of the upper seat and the mounting structure can be increased by the height block of the upper seat and the mounting block of the lower seat, respectively, to achieve structural stability.一種多功能生態浮島包含一上座，及一下座。該上座包括一底壁、一自該底壁向上延伸的圍繞壁、一自該底壁向下延伸的延伸筒，及數自該底壁向上延伸的墊高塊。該圍繞壁具有一透氣孔。該延伸筒具有一主根孔。每一墊高塊具有開口向下的凹部，該等墊高塊與該底壁、該圍繞壁界定出一開口向上且連通該主根孔的容根空間。該下座沿一第一方向與該上座卡合，並包括一承載面、一由該承載面沿該軸線延伸的導根孔，及數自該下座向上延伸的安裝塊。每一安裝塊對合於各別之墊高塊的凹部。透過該上座的墊高塊與該下座的安裝塊可以分別增加該上座與該安裝座結構的強度，達到結構穩定的功效。
