The invention relates to a pyrolyzation and carbonization heat supply system for sludge. The pyrolyzation and carbonization heat supply system for the sludge comprises a flue gas feed pipe, a cyclone dust collector, a spray treatment tower, an oil-water separator, a combustor, a drying chamber and a carbonization chamber, wherein the oil-water separator comprises a conical inlet, a vertical passage, a conical outlet and a conical baffle plate; the combustor comprises a fuel discharging component, an air pipeline, a combustor wall, an igniter and a venturi pipe; the fuel discharging component comprises a discharging end head, a fuel lifting pipe and a flame stabilizing structure; the flame stabilizing structure is arranged on the first inner side of one side of the axial line of the combustor wall; the venturi pipe is arranged on the second inner side of the other side of the axial line. By using the pyrolyzation and carbonization heat supply system for the sludge, the problems that heavy oil and light oil are not separated, a flue gas combusting structure is complicated and the emission amount of NOX is large are solved; the pyrolyzation and carbonization heat supply system for the sludge is provided.