Coal grading catalysis direct liquefaction method

The invention discloses a coal grading catalysis direct liquefaction method. The method comprises the following steps: (1) preheating coal-oil slurry, and then feeding the coal-oil slurry into a first reactor for hydro-liquefaction reaction; (2) performing gas-liquid separation on the reacted material in the first reactor through a gas-liquid separator, feeding the separated liquid-solid material into a hydraulic cyclone separator for multi-stage separation, and feeding the low-solid-content material separated in the first stage into a second reactor for deep hydrogenation reaction; a high-solid-content material separated in the second stage is circulated back to the first reactor; residual solid residues separated in the third stage are discharged out of the system; and (3) carrying out product separation on a reaction product from the second reactor to obtain a target product, namely the direct coal liquefaction oil. According to the method, the synergistic conversion effect of the macerals in the coal can