Anti-blocking drainage device

The anti-blocking drainage device comprises a drainage pipeline, a cover plate, a filter plate and a filter barrel, the drainage pipeline is arranged in a drainage well, a mounting groove is formed in the top in the drainage pipeline, the cover plate is arranged in the mounting groove, a water inlet is formed in the top of the cover plate, a cavity communicated with the water inlet is formed in the bottom of the cover plate, and the filter barrel is arranged in the cavity. The filtering plate is movably arranged at the bottom in the cavity through a fixing piece, filtering holes are densely formed in the filtering plate, a supporting plate is arranged on one side, located at the bottom, in the drainage pipeline, a plurality of connecting rods are circumferentially, uniformly and fixedly connected between the outer side wall of the supporting plate and the inner side wall of the drainage pipeline, and the filtering barrel is arranged at the top of the supporting plate; the device has the beneficial effects tha