The present invention relates to an axial-flow cyclone dust collecting apparatus, and more particularly, to an axial-flow cyclone dust collecting apparatus, which includes a line member cylinder portion in which a hammer gas is pivotally moved, a hammer gas inlet pipe and a exhaust gas discharging pipe arranged along axes at front and rear ends of the linear member cylinder portion, And a dust collection port provided in a rear end region of the tubular portion for guiding the discharge of the centrifugal dust, wherein an inner diameter of the line member cylindrical portion is within a range of 1.5 to 1.6 times the inner diameter of the inflow pipe, And a guide member which is disposed between the inlet pipe and the line member cylinder and which provides a centrifugal force to the impregnated gas introduced into the inlet pipe and starts at a leading angle of 0 to 5 degrees with respect to the axis of the turning cylinder, And a plurality of guide vanes arranged radially with a vane angle varying at an ejection angle of 75 ° to 80 °. Thus, there is provided a dust collecting apparatus in which the mutual geometrical relations of the constituent parts are optimized, the static pressure loss is small, and the dust collecting efficiency is improved.
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