The utility model relates to a separate retaining side type tapered roller bearing, which comprises a bearing inner ring, a bearing outer ring, tapered rollers and a cage. The utility model is characterized in that: the bearing inner ring is a taper ring which has an outside of a bevel, and an annular big retaining side and an annular small retaining side are respectively connected with the two ends of the bearing inner ring. The cage is an enhancement type cage made of nylon plastics. The utility model has the advantages that: the big retaining side, the small retaining side and the inner ring of the bearing inner ring are three independent components separated in the radial direction, thereby facilitating improvement of the process precision of a race and the retaining sides, enabling the surface of an inner race to be a simple tapered external diameter, providing good conditions for grinding and super finishing, consequently ensuring that the bearing realizes ideal pure rolling, accordingly reducing temperature rise, noise and friction torque, and finally improving the running efficiency of the bearing.