A flax damp spinning roller bearing comprises: an outer ring, an inner ring, a roller pin and a cage. A plurality of roller pins distributed evenly along the circumference are installed between the outer ring and the inner ring by the cage. The flax damp spinning roller bearing is characterized in that: at least a medium isolation groove along the circumference is respectively arranged at the internal circumstance surface at two ends of the outer ring. A groove along the circumstance is arranged at the external circumstance surface at two ends of the inner ring. An O-shaped seal ring is arranged in the groove. The medium isolation bearing utilizes the double protection structure of the external medium isolation groove for isolation and the interior seal ring for sealing to effectively prevent the harmful substances such as water, loam and dust from entering into the bearing, ensure the normal work environment in the bearing and prevent the lubricant oil inside the bearing from leaking outside the bearing, thus adaptive to the occasions of the flax damp spinning technological equipment and other hostile work environment.