The invention discloses a method for improving the eccentric sleeve of a high-speed precise roller grinding head and the eccentric sleeve of the high-speed precise roller grinding head. The method comprises the following steps: oil guiding grooves are formed in the eccentric sleeve, oil fluid entering the eccentric sleeve from flow controllers is introduced in hybrid bearings and a hydrostatic bearing cavities to provide lubricating oil for the bearings, and the eccentric sleeve rotates to change the central lines of the hybrid bearings so as to change the central position of the main shaft of a roll grinder and realize central convex and central concave grinding. Therefore, the rotation amount of the eccentric sleeve is changed to change the grinding concave-convex amount of a grinding wheel. With adoption of the method, internal guidance of lubricating oil can be better realized, the situation that one flow controller controls one oil inlet of the bearing is realized, and the oil inlet pressure can be better controlled; loss of oil pressure during flow diversion can be reduced without using an external flow guide tube; in addition, hybrid bearing adjusting arc chutes are formed in the eccentric sleeve, and bearing baffle plates can be adjusted through adjusting bearing end covers to adjust the bearing pressure.