A raw coal impurity automatic separator includes a rack and a shell; a rotating shaft set on the rack within the shell; shift teeth are arranged on the shaft; spiral-shaped scraping plates are fixed on the rack and are symmetrically arranged between the shift teeth; a slide block is arranged as a sleeve on each shift tooth; each slide block is provided with upper and lower rollers, between which the scrapping plates are set; a raw coal inlet is provided corresponding to an upper part of an inner cavity of the shell, a raw coal outlet is set on a lower part of the inner cavity; and an impurity outlet is set corresponding to an end of the scraping plates.
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