An apparatus for reducing an exhaust gas for heavy equipment is provided, which can satisfy the intensified diesel engine exhaust gas regulation conditions through further providing of the selective catalytic reduction (SCR) device in addition to the diesel particulate filter (DPF), and minimize an influence of vibration due to engine driving through mounting of the diesel particulate filter (DPF) and the selective catalytic reduction (SCR) device on the cowl frame. The apparatus for reducing an exhaust gas includes a cowl frame mounted on one side of the main frame that is adjacent to the engine to reduce an influence due to vibration of the engine; a diesel particulate filter (DPF) having one end portion that communicates with the other end portion of the exhaust pipe and is mounted on an upper end portion of the cowl frame, provided with diesel oxidation catalyst (DOC) therein, and capturing particulate matters; a mixing pipe having one end portion that communicates with the other end portion of the diesel
