The utility model relates to a mixed burning and incinerating comprehensive treatment device for anaerobic sludge generated in the process of treating domestic garbage leachate. The device comprises a sludge storage bin, a dehydrator, a steam sludge dryer, a garbage pit, a sludge conveyor, a flue gas purification system, a condensate water tank, an incinerating grate furnace for incinerating the garbage in the garbage pit and the dried sludge, a steam turbine which takes heat energy generated by burning in the garbage incinerating grate furnace as power, and a generator driven by the power of the steam turbine, wherein a condensate water pump is arranged in the condensate water tank; the incinerating grate furnace is connected with the flue gas purification system; and the steam turbine is connected with the steam sludge dryer. The device is simple and environment-friendly, good in effect, low in cost and high in practicability and occupies a small area, the sludge is quickly dried, and composting fermentation is not needed.