A 7800 PCTC heavy load flexible connection structure comprises a supporting rod, a first idler wheel, a first motor, a first belt, a first wheel frame, a platform, a second idler wheel, a second motor, a second wheel frame, a second belt, a first sliding block, a support, a first sliding rail, a controller, a first cylinder, a first supporting plate, a shear fork arm, a second supporting plate, first pin shafts, a first hollow-out part, a second hollow-out part, second pin shafts, an inserting rod, a double-head cylinder, a check block, a folding plate, a second cylinder, a frame, a second sliding rail, a second sliding block and a machine base. The second hollow-out part is arranged on the second supporting plate; the second hollow-out part is provided with the two second pin shafts; a piston rod of the first cylinder is connected with the second pin shafts; the first cylinder is mounted on the first sliding rail; the first sliding rail is located on the side face of the second supporting plate; the left side and the right side of the lower end of the shear fork arm are mounted on the second pin shafts separately; and the left side and the right side of the upper end of the shear fork arm are mounted on the two first pin shafts separately. The 7800 PCTC heavy load flexible connection structure has the advantage of being capable of enabling an automobile to ascend stably.