The invention discloses a flow distribution device which comprises a main pipeline, a primary pipeline, at least one secondary pipelines and at least one shunting element, wherein one end of the primary pipeline is communicated with one end of the main pipeline; the primary pipeline and the extension line of the main pipeline form a first angle; one end of each secondary pipeline is communicated with one end of the main pipeline; the secondary pipeline and the extension line of the main pipeline form a second angle; and the shunting element penetrates the secondary pipeline and is used for adjusting the flow in the primary pipeline and the secondary pipelines. By adopting the flow distribution device disclosed by the invention, accurate distribution of coal water slurry as well as safe and reliable long-cycle operation of the device are realized.