The invention relates to a coal-based active carbon powder production method, which comprises that 1, an adding volume ratio of bituminous coal to titanium concentrate in a reduction kiln is controlled to not less than 1:1, the temperature of a high temperature zone in the reduction kiln is controlled to not lower than 1100 DEG C, and fine coal ash is produced; 2, the fine coal ash is subjected tomagnetic separation by a magnetic separator with a magnetic field strength of 1000-1500 GS; 3, the magnetically-separated fine coal ash is screened with a 10-40 mesh sieve, heavy impurity waste is removed from the coal particles on the sieve by a dry jigger to obtain pure coal particles, and heavy impurity waste is removed from the undersize coal ash by a wind power sorting machine to obtain purecoal ash; and 4, the pure coal particles and the pure coal ash are combined, and grinding is performed by a Raymond mill to obtain the coal-based active carbon powder, wherein the bituminous coal forrotary kiln production of reduced ilmenite selects fine bituminous coal with a fixed carbon content of not less than 48%, a volatile matter content of not less than 25% and an ash content of not morethan 8%. According to the present invention, with the method, the breaking and activation treatment on the raw coal is not required so as to reduce the energy consumption and save the coal-based active carbon production cost.