The invention provides a land transportation method for a large-diameter super-long HDPE pipeline. The method comprises the following steps that S1, a transportation track, land winches, a barge, a water winch and a loading machine are arranged; S2, transportation trolleys are arranged on the transportation track; S3, land towing mount points and a water towing mount point are arranged; S4, the land winch mount points and the water winch mount point are connected; S5, the barge, the water winch, the loading machine and the land winches work to drive a pipe section to be transported to move inthe direction towards the water surface; S6, when the pipe section to be transported moves by a set distance, the land winch mount points are removed, and the barge and the water winch continue to work so as to pull the pipe section to be transported; S7, when the pipe section to be transported moves to the junction of water and land, the loading machine is removed, the barge and the water winch continue to work, and the pipe section to be transported completely enters the water; and S8, the transportation trolleys are recycled, and land transportation of the pipeline subjected to underwater butt joint is completed.