The utility model provides a thermal power plant coal blending system which comprises a machine set, an automobile coal unloading ditch, an automobile coal unloading ditch belt, a bucket wheel machine, a bucket wheel machine coal yard coal fetching belt, a cylindrical bin, an annular type coal feeder, an impeller coal feeder, a boiler, a combustor, a main mill and a spare mill. The automobile coal unloading ditch comprises a bin, the automobile coal unloading ditch belt and the bucket wheel machine coal yard coal fetching belt are both connected with the cylindrical bin, the cylindrical bin is connected with the annular coal feeder and the impeller coal feeder, the combustor is arranged in the boiler, the spare mill is arranged on the bottom of the combustor, and the main mill is arranged in the combustor. The thermal power plant coal blending system is reasonable in design, carries out blending on raw coal for four times, and achieves optimization of the blending of fuel coal. Meanwhile, cost investment is not increased, operability is high, both safety and benefit are achieved, and earnings are obvious.