Precise bearing assembling method

The invention provides a precise bearing assembly method which comprises the following steps: a positioning hole for mounting a plug is formed in the outer diameter surface of an outer ring, a mounting through hole is formed in the axial end surface in a penetrating manner, and a taper pin hole is formed in the plug; a first marking line L1 aligned with the axis of the mounting through hole is carved on the outer ring through laser printing, and a second marking line L2 aligned with the axis of the taper pin hole is carved on the outer end face of the plug; assembling the inner ring, the outer ring and the rollers into a semi-finished product, namely assembling all the rollers into a bearing raceway; putting a plug into the plugging hole, and rotating the plug to align the two marking lines; slightly pressing the plug to attach the inner end face of the plug to the roller; radial force is applied to the inner ring, then the inner ring is slowly rotated, and the rollers rotate along with the inner ring so that