The invention provides an inflatable pressure-bearing breeding fish raft composed of plastic floating barrels. The breeding fish raft comprises the floating barrels, floating bridges and binding pieces. Each floating barrel comprises a middle body, a top cover, a bottom cover, a first supporting piece and a second supporting piece, wherein the first supporting piece and the second supporting pieceare solid discs, one end of the middle body is connected with the top cover through the first supporting piece, the other end of the middle body is connected with the bottom cover through the secondsupporting piece, the top cover and the bottom cover are each provided with an inflation assembly, the middle body is in a hollow cylinder shape with two end faces sealed, the centers of the two end faces of the middle body are provided with check valves, a longitudinal partition plate, a longitudinal central partition plate and a transverse partition plate are arranged in the middle body, the longitudinal central partition plate is in a solid disc shape, the longitudinal partition plate is annular, and the transverse partition plate is in a rectangular frame shape. Compared with the prior art, the breeding fish raft has the advantages of being good in inflatable effect and pressure-bearing effect, long in service life, high in rigid strength and the like.