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Advantages and disadvantages of heat-dissipating method of electrical equipments for open-pit shearer were analyzed. According to actual condition of open-pit shearer, filter cartridge deduster was used to ventilate and dissipate heat for frequency-conversion speed-regulation device and step-down transforms of open-pit shearer, and the original dedusting ventilation equipment was used to ventilate and heat operating room. The application of filter cartridge deduster and ventilation equipment in the open-pit shearer, not only ensures reliable operation of open-pit shearer and prolongs service life of components of electrical equipment, but also make heat distributed by electrical equipment recycle and reuse and achieve effect of energy saving.