Cyclone separator

The utility model aims at providing a cyclone separator suitable for a coal pyrolysis gasifier. The cyclone separator comprises a cyclone separator body; the upper part of a center pipe of the cyclone separator body is communicated with a semi-coke bin; a separation net is arranged at the communicated part between the semi-coke bin and the center pipe; the lower part of the semi-coke bin is provided with a material return pipe; the material return pipe is provided with a valve. The cyclone separator not only has the characteristics of a common cyclone separator, but also has the characteristic of particle bed filtering as the semi-coke bin, into which semi-coke particles in a stacking state can be introduced, is added onto the center pipe, thus being a double-function cyclone separator with a remarkable purification function.