Abstract: A structure of ashtray, capable of self-cleaning and automatic fire-extinguishing, comprising a housing with an opening extending through the upper, the lower, the left and the right side, and with a cylindrically shaped body disposed in the center of the housing with a dust collecting drum mounted inside said cylindrically shaped body. The dust collecting drum has a plurality of collecting chambers and can be turned to revolve by means of a rotatable shaft so that any cigarette butt or garbage that is thrown inside can slide into a container attached beneath the housing and closely covered by said dust collecting drum during the time while the dust collecting drum is turned so that any burning cigarette butt that slides into the container will be promptly and automatically extinguished due to lack of air.