Crane for building offshore platform

The utility model provides a crane for building an offshore platform, and belongs to the technical field of equipment of ocean engineering. The crane comprises a crane body, a base, a folding rod, a concave groove, a cable, a guide rod, rollers and a rotating platform; the crane body is arranged at the upper part of the base; the folding rod is mounted on the left side of the crane body; two rollers are mounted on one side of the folding rod; the guide rod is mounted in the front part of the folding rod; a concave groove in which the cable is paved is arranged in the left side of the base; the cable enters the crane body through the folding rod; the rotating plate is mounted at the upper part of the concave groove through a hinge; the guide rod is made of titanium alloy and equipped with a semicircular head part, and the guide rod is lower than the rotating plate. According to the crane, the concave groove structure is used to hide the cable, thus the cable is prevented from exposing to the sun and rain, and as a result, the service life of the cable is greatly prolonged; meanwhile, the original coil arrangement is replaced by linear arrangement, and thereby, the electromagnetic induction is avoided production, and as a result, the power transmission efficiency is raised, and energy saving and environmental protection are realized.