The invention discloses an insert bearing. The insert bearing comprises a bearing support, an extended inner ring, a rubber seal ring, a check ring, an aligning spherical surface and a nozzle, wherein the rubber seal ring is connected with the extended inner ring; the check ring and the nozzle are connected to form a whole body and arranged on the aligning spherical surface; the aligning spherical surface is connected with the extended inner ring; the bearing support is arranged at the bottom of the extended inner ring. Through the way, the insert bearing disclosed by the invention has the advantages of simple structure, high accuracy, convenience in use and easiness in installation.