Sludge drying heat source is derived from the tail gas of cement kiln (greater than 400 DEG C), which can meet the requirements of sludge drying. The drying process adopts the horizontal drying and scattering technology, which can break the material into tiny particles, increase the contact area between the hot air and the sludge, and increase the drying intensity. After drying the sludge into the incinerator for incineration, and drying after containing odorous gases into the incinerator at high temperature decomposition, the whole process is simple and mature, no smell, can meet the requirements of environmental protection standards.