High precision overloading composite bearing structure

The invention relates to a high-accuracy heavy load composite bearing, which comprises a main axle, an inner taper rolling bearing, a pushing bearing, an end cover, an axially static bearing, a radial static bearing and an elastomer, wherein two ends of front axial should of main axle are mounted with axial static bearing and radial static bearing which are connected and fixed inside the front support of main axle box via the axial static bearing; the back end of main axle is mounted with inner taper rolling bearing, pushing bearing; the back end of pushing bearing via the elastomer is axially connected to the end cover; the end cover is fixed with the back support of main axle box. The inventive bearing system has high support ability, high rotation accuracy, which can support the 20t work piece to be grinded.