The utility model relates to the technical field of roller bearing, in particular to a sealed traveling wheel structure, comprising an inner ring, an outer ring, a roller, an inner isolating ring of the cage and a single sealing structure. The sealing part and the transition of the sealing part constitute a sealed module, the sealing part and the outer ring compose a labyrinth seal, and the gasket ring on the sealing part and outer ring 7 are sealed together. The utility model has the advantages of thoroughly solving the problems of bearing seal for traveling wheel, greatly improving sealing effect of bearing, prolonging the service life of bearing, and has convenient and reliable assemble and disassembly.