Automatic siphon drainage device for basement roof

The utility model discloses an automatic siphon drainage device for a basement roof, and relates to the technical field of garage drainage. Comprising a siphon roof drain arranged at the top end of a roof body, a filter cover arranged on the surface of the siphon roof drain, a water pipe arranged at the bottom end of the roof body and a water tank arranged at the bottom end of the water pipe. The surface of the filtering cover is sleeved with a connecting ring, and first connecting rods are annularly connected to the inner wall of the connecting ring at equal intervals. According to the water purifier, the supporting rod, the connecting plate, the second connecting rod, the fourth connecting rod, the connecting pipe and the like can be driven to move through the buoyancy of the floating ball in water, and the second connecting rod can drive the connecting ring and the first connecting rod to move on the surface of the filtering cover when moving; garbage blocked on the surface of the filtering cover can be mo