The utility model discloses a high -efficiency sewage treating device, including the sewage case, the water pipe has all been cup jointed in the opening of sewage roof portion and bottom, support plate fixedly connected with motor is passed through to one side of water tank, the output of motor and the one end fixed connection of pivot, the other end of pivot runs through the sewage case and extends to its outside, the connection of circle cover is passed through to dirty inner wall surface of water tank's both sides, and round cup jointing in the pivot, it has cup jointed three the initiativetaper gear just to be located circle cover equidistance in the pivot, the initiative taper gear and the meshing of driven bevel gear wheel. The utility model discloses a to the improvement of smashing the leaf, the starter motor can drive the initiative taper gear through the pivot and rotate, cooperates the use of driven bevel gear wheel, and the crushing leaf that can make the bull stick driveon the nahlock rotates to can smash the inside impurity of sewage, the use of cooperation belt can make the driven round of rod for crushing who drives on the movable rod rotate, and the impurity of so as to in to sewage carries out the regrinding.