The invention discloses a buffer conditioning system for lime sludge. The buffer conditioning system comprises a buffer conditioner, an automatic sludge inlet valve, a sludge circulating pump, a sludge feeding pump, an automatic conditioning water inlet valve, automatic flushing valves and a control system, wherein sludge enters the buffer conditioner from the top through the automatic sludge inlet valve, and sludge concentration meters are mounted behind the automatic sludge inlet valve; the sludge is discharged from the bottom of the buffer conditioner in a sludge circulating system and is circulated into the buffer conditioner from the top by the sludge circulating pump, the sludge concentration meters are mounted on a sludge circulating pipeline, and automatic sludge discharging valves are mounted at a sludge outlet in the bottom of the buffer conditioner; sludge is discharged from the bottom of the buffer conditioner in a sludge feeding system and is pumped into a subsequent sludge dewatering system through the sludge feeding pump; conditioning inlet water enters the buffer conditioner from the top through the automatic conditioning water inlet valve; and automatic flushing systems and the automatic flushing valves are arranged on all sludge pipelines.