A raw coal separation process with high economic benefit and low cost comprises the steps of : classifying the raw coal by classifying screen; outputting the obtained underscreen materials, and washing and separating overscreen materials in a jigging machine; outputting obtained waste rocks and middlings, inducing the obtained cleaned coal blocks into staged dewatering screen to give underscreen water which is sent into deep cone concentration tank; outputting obtained large-size cleaned coal blocks, inducing the obtained small-size cleaned coal blocks into spin extractor to give underscreen water which is sent into deep cone concentration tank; outputting small-size cleaned coal blocks and inducing the centrifugate into deep cone concentration tank; underflow after condensation by the deep cone concentration tan entering into swirler; underflow in swirler entering into high frequency screen and overflowing liquid entering into slant-tube thickener; overscreen materials of high frequency screen entering into spin extractor and underscreen water entering into deep cone concentration tank; overflowing liquid in deep cone concentration tank entering into slant-tube thickener; overflowing liquid in slant-tube thickener entering into circulating water tank; condensed underflow entering into belt type press filter; outputting obtained coal slime, and the filtrate entering into circulating water tank.