Novel combined type roof greening tank with communication of matrixes

The invention discloses a combined type roof greening tank which is suitable for roof greening and can maintain the communication of matrix layers. The combined type roof greening tank comprises a water storage and drainage bottom plate, a surrounding plate and a water absorbing carpet, wherein the water storage and drainage bottom plate and the surrounding plate are respectively made by punching HDPE (high density polyethylene) plastic rubber bottom plates. The combined type roof greening tank has the advantages that the water storage space of the water storage and drainage bottom plate is large, the water distribution is uniform, and the water drainage is smooth; lower surrounding ridges and reinforcing ribs are arranged around the plate surface of the bottom plate; the bottom plate is provided with connecting bayonest, and can be combined and spliced with other bottom plates; the surrounding plate can be installed or detached according to requirements, and can be repeatedly used; after multiple tank bodies are spliced, the surrounding plates are plugged out, so that the planted matrixes can be connected into a whole, plant roots obtain open development space, and the development space is favorable for plants to survive and grow; the appearance is not blocked, and more attractiveness is realized; during removal or detachment, the surrounding plate is inserted into a corresponding position again, so as to facilitate handling; the water absorbing carpet is formed by crushing and pressing recycled cloth, a water absorbing belt is arranged under the water absorbing carpet, and water can be supplemented into the matrixes from bottom to top.