A recirculating roller bearing, comprising a front cover plate, a rear cover plate, an inner supporter, a sealing covering, a plurality of rolling carriers and at least one connector, wherein: the front cover plate and the rear cover plate are detachable connected to two opposite sides of the inner supporter respectively, the sealing covering is arranged between the front cover plate and the rear cover plate in a sealing manner and is arranged around the inner supporter; a circulating guiding path is formed between the front cover plate, the rear cover plate, the inner supporter and the sealing covering, the circulating guiding path comprises a sealing portion and an opened load-bearing portion; the plurality of rolling carriers are all filled in the circulating guiding path, each of the plurality of rolling carriers is in rolling fit with the inner supporter, and each of the plurality of rolling carriers is in rolling fit with a retractable fork when passing the opened load-bearing portion of the circulating guiding path; characterized in that: the connector is configured to detachably fix the inner supporter, the front cover plate and the rear cover plate on a main frame body; a load-bearing point is defined at a contact position between a radially outmost portion of the plurality of rolling carriers at the opened load-bearing portion and the retractable fork, two ends of the sealing covering at the opened load-bearing portion are provided with a protruded portion protruding relative to the load-bearing point respectively, characterised in that the protruded portion is elastic and is configured to abut against a contact surface of the retractable fork in a sealing manner. the front cover plate and the rear cover plate are detachable connected to two opposite sides of the inner supporter respectively, the sealing covering is arranged between the front cover plate and the rear cover plate in a sealing manner and is arranged around the inner supporter; a circulating guiding path is formed between the front cover plate, the rear cover plate, the inner supporter and the sealing covering, the circulating guiding path comprises a sealing portion and an opened load-bearing portion; the plurality of rolling carriers are all filled in the circulating guiding path, each of the plurality of rolling carriers is in rolling fit with the inner supporter, and each of the plurality of rolling carriers is in rolling fit with a retractable fork when passing the opened load-bearing portion of the circulating guiding path; characterized in that: the connector is configured to detachably fix the inner supporter, the front cover plate and the rear cover plate on a main frame body; a load-bearing point is defined at a contact position between a radially outmost portion of the plurality of rolling carriers at the opened load-bearing portion and the retractable fork, two ends of the sealing covering at the opened load-bearing portion are provided with a protruded portion protruding relative to the load-bearing point respectively, characterised in that the protruded portion is elastic and is configured to abut against a contact surface of the retractable fork in a sealing manner. the connector is configured to detachably fix the inner supporter, the front cover plate and the rear cover plate on a main frame body; a load-bearing point is defined at a contact position between a radially outmost portion of the plurality of rolling carriers at the opened load-bearing portion and the retractable fork, two ends of the sealing covering at the opened load-bearing portion are provided with a protruded portion protruding relative to the load-bearing point respectively, characterised in that the protruded portion is elastic and is configured to abut against a contact surface of the retractable fork in a sealing manner.