The utility model discloses a sewage treatment equipment. This sewage treatment equipment includes the sludge impoundment, a screw rod, whirl clarifier and float gauge, float gauge is including detecting the guide arm, the floater, the circuit board, flange and display instrument, it inserts in the sludge impoundment perpendicularly to detect the guide arm, the flange cover is established on detecting the guide arm, and with detect guide arm fixed connection, the top of sludge impoundment links to each other with the flange, the part that the measuring guide arm stretched into the sludge impoundment is equipped with stopper and lower stopper, floater activity sets up at last stopper under and on the measuring guide arm between the stopper, the circuit board is located and is detected in the guide arm, display instrument sets up on the outside detection guide arm of sludge impoundment, display instrument, the floater is and gate board signal connection respectively, spiral shell sucker-rod pumping and whirl clarifier and float gauge linkage, spiral shell sucker -rod pumping only moves during the stopper under the floater is higher than, the whirl clarifier only moves during the stopper on the floater is less than. The utility model discloses can real -time supervision sludge impoundment liquid level, avoid that spiral shell sucker -rod pumping is empty to be taken out.