The invention discloses a hoisting and righting method for a tension tendon of a tension leg platform. The hoisting and righting method for the tension tendon of the tension leg platform comprises the following steps that 1, an upper section and main body section of the tension tendon is arranged on a deck of a floating crane ship; 2, a floating crane rigging hoisting device is connected and an auxiliary hoisting device is connected; 3, amplitude varying operation is carried out, so that the upper section and main body section of the tension tendon is slowly lifted and is kept horizontal after leaving the deck of the main ship by a certain distance, at the moment, the amplitude variation of a crawler crane and the height of a lifting hook of the crawler crane are not changed, then the amplitude varies continuously, a floating crane rotates, and a floating crane lifting hook is lifted, so that the upper section and main body section is righted stably and safely in the air; 4, the triangular plate auxiliary hoisting device is loosened, a lifting bucket falls off slowly and freely, a hoisting belt freely slides out of the bottom of the upper section and main body section, and hoisting and righting are completed; and 7, the hoisting and righting steps are repeated to complete the righting of a bottom section. According to the method, not only the tension tendon can be hoisted and turned, the construction operation risk is greatly reduced, but also the construction efficiency is greatly improved.