A cyclone distributor, a gasification nozzle and a coal gasification system are disclosed. The cyclone distributor includes a shell (1), a cyclone body (2) and a plurality of distributing branch pipes (3). A cavity inside the shell includes a feeding cavity (J), a cyclone cavity and a distributing cavity (C) which are formed from top to bottom. The cyclone body is disposed in the cyclone cavity. The plurality of the distributing branch pipes which are arranged at intervals are connected to the outer shell of the distributing cavity separately. A cyclone passage is formed between the inside wall surface of the shell and the peripheral surface of the cyclone body. A material stream fed into the feeding cavity forms downward eddy flow in the cyclone passage. The eddy flow enters the distributing cavity and is distributed into the plurality of the distributing branch pipes. The gasification nozzle includes a nozzle top plate (5) and the cyclone distributor. A plurality of material stream passages (51) at intervals are formed in the nozzle top plate in a penetrating manner and are connected to the plurality of the distributing branch pipes in a one-to-one correspondence manner. Dispersion effects of the cyclone distributor on a gasification raw material are good, the raw material can be evenly distributed into each spraying unit of the gasification nozzle, and gasification effects are good.