Abstract: A water purification system for a hard bottom landscape water body is provided, with a bottom of the hard bottom landscape water body paved with hard materials, comprising a filling element layer and a frame body, wherein the frame body is paved on the bottom of the landscape water body; the frame body includes a cover plate with a plurality of through-holes, and a plurality of supporting parts positioned below the cover plate; the filling element layer includes a plurality of filling elements disposed between the plurality of supporting parts positioned below the cover plate, and the filling elements further include structures configured for microorganisms in water to adhere to. In the present application, the filling element layer provides an adhesion medium for the microorganisms in water, and the frame body provides a protection to the filling element layer, which creates an advantageous site for the microorganisms in water.