The invention relates to an impurity-removing and feeding box. The impurity-removing and feeding box comprises a material box, a buffer plate, a sieve, an impurity-removing door and a discharge pipe,wherein the buffer plate is obliquely positioned at the central part of the interior of the material box and located below the discharge outlet of an ore pulp pipeline; the sieve is horizontally positioned at the central part of the interior of the material box and is connected with the buffer plate; the impurity-removing door is positioned at one side of the sieve far away from the buffer plate and arranged on the side wall of the material box; the discharge pipe is positioned below the impurity-removing door and communicates with the bottom part of the interior of the material box; the sidewall of the material box corresponding to the sieve is provided with an air cylinder; a material scraping rod is arranged on the sieve; and the output shaft of the air cylinder is connected with the material scraping rod and drives the material scraping rod to scrap a material on the sieve. Compared with the prior art, the impurity-removing and feeding box has the following advantages: the air cylinder drives the material scraping rod to scrap the material on the sieve, and impurities are removed out from the impurity-removing door, so impurity-cleaning efficiency is accelerated, and impurity-removing efficiency is high.