Cutting machining bearing device

The utility model provides a cutting machining bearing device. The device comprises a disc base and at least four pressing plates which are connected with the base through bolts and used for clamping a cylindrical piece. A support is arranged between each pressing plate and the base, a central hole is formed in the base, the diameter of the central hole is equal to that of a protruding portion, the depth of the central hole is larger than the height of the protruding portion, four first mounting holes and a plurality of second mounting holes are formed in the outer side of the central hole, the first mounting holes are evenly distributed, the first mounting holes are spaced by 90 degrees, a positioning face is arranged on the outer side of each first mounting hole, a positioning hole is formed in the positioning face, and a plurality of through kidney-shaped grooves are evenly distributed in the base in the radial direction. The cutting machining bearing device can achieve the safe and accurate positioning and clamping of the cylindrical piece, and in the split cutting machining process, labor intensity can be reduced, safety production can be ensured, and machining efficiency can be improved.