The invention discloses a dust-removing filter bag with deflation-preventing rings. The dust-removing filter bag comprises a filter bag body, a mounting plate, a clamping plate, a plurality of deflation-preventing rings and a plurality of vertical rods, wherein the mounting plate, the clamping plate and the deflation-preventing rings are circular ring-shaped plates; each vertical rod comprises a threaded rod and a frustum-shaped rod; the mounting plate comprises a plurality of cylindrical through holes; the number of the cylindrical through holes is equal to that of the vertical rods; the deflation-preventing rings are distributed from top to bottom; each deflation-preventing ring comprises a plurality of frustum-shaped through holes; a locking nut is arranged on each threaded rod; the upper surface of the mounting plate is pressed against the locking nuts; except the bottommost deflation-preventing ring, pressing vertical rods are fixed to the lower surfaces of the other deflation-preventing rings; the bottom end of the pressing vertical rod of each deflation-preventing ring presses against the upper surface of the lower deflation-preventing ring; the diameter of the bottom of thefrustum-shaped rod is larger than the diameter of the bottom of the frustum-shaped through hole in the bottommost deflation-preventing ring. The filter bag is mounted in an assembled way, can be detached for transportation and is convenient to use.