The burnt expanded ceramsite can be obtained by short-term sintering at 1040 ℃ with the wet excess sludge of urban sewage treatment plant as the main raw material, supplemented by aggregate tail sludge (mainly consisting of soil) and fly ash as the ingredients. The bulk density is 480kg/m?; The solubility of hydrochloric acid is 1.86%; The barrel pressure strength is 3.2MP