The invention discloses a pickling impurity removal method for removing impurities after metallurgical silicon drawacharge and before melting purification. The method comprises the following steps: slowing down the cooling process of the drawacharge of the metallurgical silicon, smashing the cooled metallurgical silicon into silicon powder with certain granularity, and selecting a plurality of acids to carry out pickling operation on the silicon powder according to a certain sequence. The invention also discloses pickling impurity removal equipment, a metallurgical silicon purification methodand a metallurgical silicon purification system. In the invention, optimized cooling process and reasonable pickling sequence are adopted, and proper granularity and suitable temperature are selected,therefore, the pickling process flow is optimized to realize the optimal pickling effect, the content of Fe, Al, Ca, Mn, Ti, Ni and other metal impurities are effectively reduced, and the purification purpose is realized.