The invention relates to a dynamic pressure cylinder bearing which comprises a support seat, an accommodating piece and a rotating piece, wherein the accommodating piece is provided with a plurality of dynamic pressure channels allowing fluid to pass through; the dynamic pressure channels are arranged in the inner walls of the accommodating piece, penetrate through an indent cylinderical surface and an outer surface and comprise first concave cavities and first pore passages; the first concave cavities are formed in the indent cylinderical surface and are concave inwards; the first pore passages communicate with the first concave cavities and the outer surface; the first concave cavities are formed in the indent cylinderical surface along at least one arranged plane; the arranged plane isa plane perpendicular to the rotary axis of the rotating piece; the cross section of each of the first concave cavities is gradually enlarged from the bottom to an opening; the support seat is provided with a support seat cavity matched with the outer surface of the accommodating piece; and at least one support seat passage communicating with the first pore passages is arranged on the support seat. According to the dynamic pressure cylinder bearing, under the working state, a protruding column and the indent cylinderical surface are not contacted when the protruding column rotates, so that thedynamic rotating precision of a rotary shaft on a revolute pair can be improved by adopting the gas or liquid dynamic pressure technology.