The invention discloses a fullerene coarse ash dustless collection device and a collection method thereof. The fullerene coarse ash dustless collection device comprises a shell, a cover plate covering an upper opening of the shell, an ash bucket detachably mounted on a lower opening of the shell, a plurality of filter drum devices arranged in the shell, a draught fan arranged on the cover plate and a reverse blowing device arranged on the cover plate. The shell is of a hollow barrel-shaped structure of which the upper portion and the lower portion are open. The draught fan is used for extracting coarse ash in an external coarse ash collection tank into the shell. The reverse blowing device is used for blowing the coarse ash on the filter drum devices down into the ash bucket. During work, a gas inlet air pipe of the shell is connected with the coarse ash collection tank; the draught fan extracts the coarse ash into the shell in a gas conveying manner; the coarse ash in dust-containing gas is filtered by the filter drum devices, and the reverse blowing device blows the coarse ash on the filter drum devices down into the ash bucket; and a discharging valve on a transfer tank connector at the bottom of the ash bucket is opened, and the coarse ash is subjected to centralized collection treatment. The fullerene coarse ash dustless collection device is simple in structure and can collect the coarse ash in a dustless manner, and dust pollution is avoided.