A combined hydrogenation process method for producing high-quality fuel by medium-low-temperature coal tar, comprising the following steps: step i, mixing a medium-low-temperature coal tar, a catalyst, a fresh hydrogen and a recycle hydrogen and directly entering a thermal hydrocracking unit; after reaction in the thermal hydrocracking unit, making the gas product enter a pipe network, while the liquid product enters a first atmospheric fractionation unit; step ii, fractionating the liquid product into a naphtha, a diesel and an atmospheric residual oil through the first atmospheric fractionation unit; step iii, mixing the naphtha, the fresh hydrogen and the recycle hydrogen and entering a naphtha hydro-refining unit; after reaction in the naphtha hydro-refining unit, making the gas product enter a pipe network, while the liquid product is a refined naphtha; step iv, making the atmospheric residual oil enter a vacuum fractionation unit, and fractionating the atmospheric residual oil into a tail oil and a wax oil through the vacuum fractionation; the tall oil is used to prepare a new carbon material; step v, mixing the diesel with the wax oil, and then mixing with the fresh hydrogen and the recycle hydrogen, and then entering a diesel and wax oil hydro-upgrading unit; after reaction in the diesel and wax oil hydro-upgrading unit, making the gas product enter a pipe network, while the liquid product enter a second atmospheric fractionation unit, and fractionating the liquid product into a modified naphtha, a modified diesel fraction and a modified wax oil in the second atmospheric fractionation unit; step vi, mixing the modified wax oil with the cracked wax oil, and then mixing with the fresh hydrogen and the recycle hydrogen, and then entering a wax oil hydro-cracking unit; after reaction in the wax oil hydro-cracking unit, making the gas product enter a pipe network, while the liquid product enter a third atmospheric fractionation unit, and fractionating the liquid product into a cracked naphtha, a cracked diesel fraction and a cracked wax oil fraction in the third atmospheric fractionation unit; step vii, mixing the refined naphtha with the modified naphtha, the modified diesel, the cracked naphtha and the cracked diesel, and then mixing with the fresh hydrogen and the recycle hydrogen, and then entering a gasoline and diesel precious metal hydrogenation unit; after reaction in the gasoline and diesel precious metal hydrogenation unit, making the gas product enter a pipe network, while the liquid product enter a fourth atmospheric fractionation unit, and fractionating the liquid product in the fourth atmospheric fractionation unit to yield a final product. step i, mixing a medium-low-temperature coal tar, a catalyst, a fresh hydrogen and a recycle hydrogen and directly entering a thermal hydrocracking unit; after reaction in the thermal hydrocracking unit, making the gas product enter a pipe network, while the liquid product enters a first atmospheric fractionation unit; step ii, fractionating the liquid product into a naphtha, a diesel and an atmospheric residual oil through the first atmospheric fractionation unit; step iii, mixing the naphtha, the fresh hydrogen and the recycle hydrogen and entering a naphtha hydro-refining unit; after reaction in the naphtha hydro-refining unit, making the gas product enter a pipe network, while the liquid product is a refined naphtha; step iv, making the atmospheric residual oil enter a vacuum fractionation unit, and fractionating the atmospheric residual oil into a tail oil and a wax oil through the vacuum fractionation; the tall oil is used to prepare a new carbon material; step v, mixing the diesel with the wax oil, and then mixing with the fresh hydrogen and the recycle hydrogen, and then entering a diesel and wax oil hydro-upgrading unit; after reaction in the diesel and wax oil hydro-upgrading unit, making the gas product enter a pipe network, while the liquid product enter a second atmospheric fractionation unit, and fractionating the liquid product into a modified naphtha, a modified diesel fraction and a modified wax oil in the second atmospheric fractionation unit; step vi, mixing the modified wax oil with the cracked wax oil, and then mixing with the fresh hydrogen and the recycle hydrogen, and then entering a wax oil hydro-cracking unit; after reaction in the wax oil hydro-cracking unit, making the gas product enter a pipe network, while the liquid product enter a third atmospheric fractionation unit, and fractionating the liquid product into a cracked naphtha, a cracked diesel fraction and a cracked wax oil fraction in the third atmospheric fractionation unit; step vii, mixing the refined naphtha with the modified naphtha, the modified diesel, the cracked naphtha and the cracked diesel, and then mixing with the fresh hydrogen and the recycle hydrogen, and then entering a gasoline and diesel precious metal hydrogenation unit; after reaction in the gasoline and diesel precious metal hydrogenation unit, making the gas product enter a pipe network, while the liquid product enter a fourth atmospheric fractionation unit, and fractionating the liquid product in the fourth atmospheric fractionation unit to yield a final product.