An integral land assembly technology of a tension leg platform includes the following steps that firstly, a plurality of cushion piers and supports are arranged on a wharf; secondly, a hull and an upper portion module are built on the cushion piers and the supports respectively; thirdly, a plurality of jacking devices are arranged at the bottom of the upper portion module; fourthly, the upper portion module is jacked to a set height through the jacking devices; fifthly, a plurality of sliding devices are arranged at the bottom of the hull; sixthly, the hull is slid to the bottom of the upper portion module through the sliding devices; seventhly, the sliding devices are lowered simultaneously so that the hull can fall onto the cushion pipers, and the sliding devices (7) are withdrawn; eighthly, the jacking devices are lowered synchronously so that the upper portion module can fall onto the hull and be connected with the hull into a whole; ninthly, all the jacking devices are removed, and installation is completed. According to the technology, integral land assembly of the tension leg platform is achieved in a jacking and sliding mode, the problems that in offshore lifting of the tension leg platform, risks are high, the period is long, and welding quality is difficult to ensure are solved, risks existing in offshore commissioning are lowered, and commissioning efficiency is improved; besides, a technical guarantee is further provided for integral wharf commissioning of the tension leg platform.