The utility model discloses a rotating control head pressure -loaded bearing, including the tapered roller of last bearing plate, area direction, lower track bearing plate, outer holder, interior holder, the tapered roller is a cone, and the cone both ends are the cylinder of the same diameter, the same length. The plane and the umbrella -type inclined plane interior angle of cone main aspects are an angle, are the c angle with inclined plane axial outside the umbrella -type. The track bearing plate is personally experienced sth. Part of the body for annular radial flange down, and open on upper portion has an annular circular cone groove, and the long inclined plane in awl groove is the c angle with last facial planes, another inclined plane in awl groove is an angle with long inclined plane, an angle and the c angle in awl groove an angle on the tapered roller of area direction respectively equal with the c angle. The beneficial effects of the utility model are that: satisfy the continuous cycle well drilling in well drilling techniques such as narrow density window well, ocean deep water well drilling, big displacement well, horizontal well, underbalance well, high temperature high pressure well and gas hydrate exploitations, effectively prevent downhole accident's emergence.