Composite biomechanical filter

The utility model discloses a composite biomechanical filter. The composite biomechanical filter comprises a shell and a water pumping device which is positioned outside the shell, wherein at least two partition plates with through holes are arranged inside the shell from bottom to top, and are used for defining a filter region in an inner cavity of the shell; a water inlet region is formed below the filter region, and a water outlet region is formed above the filter region; a semi-floating filter material and a full-floating filter material, which are different in bio-film formation time, are filled in the filter region; a water inlet and a water outlet, which are communicated to the water inlet region, are formed in the lower end of the shell; the water pumping device is connected to the water outlet through a pumping pipe and is connected with a backwashing pipe which penetrates through the shell and correspondingly extends into the filter region; and the water outlet region is connected with a water outlet pipe which extends out of the shell. The composite biomechanical filter can be used for filtering diversified materials, and is large in specific surface area, high in filter efficiency, simple in backwashing operation, good in backwashing effect, small in size and small in land occupation.