The invention provides an offshore installation construction resource-combined type pontoon barge. The combined type pontoon barge (1) comprises a flat plate ship body (2), a portal jib crane (3), a crane (4), a cantilever beam (5), an awler crane (6), a slide rail (7) and a removable deck (8), wherein the portal jib crane (3), the crane (4), the cantilever beam (5), the awler crane (6), the slide rail (7) and the removable deck (8) are arranged on the flat plate ship body, and at the same time, a left and right water ballast tanks (11), a fresh-water tank (12), a bilge tank (13), a hydraulic motive power station tank (generator tank) (14), a fuel oil tank (15), a ballast tank control tank (16), a dust tank (17) and a living tank (18) for meeting the living and residing requirements of 60 persons are arranged on the flat plateship body (2). The pontoon barge is mainly used for the transportation and the installation operation of large structures of ocean engineering, and can also be used for the installation of expansion bend parts, offshore pipe pavement construction operation and the like. The invention has the advantages that the shipping, the transportation and the offshore installation can be realized at the same time, the risk of offshore installation construction is reduced, the offshore construction resources are reduced, and the time is saved.