Sealing structure for hub bearing

The utility model relates to the technical field of hub bearing sealing, in particular to a sealing structure for a hub bearing, which comprises a flange plate hub, a sealing outer ring arranged outside the flange plate hub, a first framework arranged at the joint of the flange plate hub and the sealing outer ring, a water swelling strip arranged at the top end in the first framework, and a push plate arranged on one side of the water swelling strip. A spine is arranged on one side of the push plate and connected with a rubber ring, fluorescent liquid is arranged in the rubber ring, fixing plates are arranged at the upper end and the lower end in the rubber ring, springs are connected to the inner walls of the fixing plates and the rubber ring, rubber pads are arranged at the bottom ends of the water swelling strip and the push plate, and a connecting hole is formed in the top end of the water swelling strip. The water swelling strip and the fluorescent liquid are additionally arranged in an existing sealing