Abstract: A lavatory seat controller which makes use of a lever by pressing on a pedal coupled to a lavatory seat lifting pedal rod to drive a straight push rod to rotate through a predetermined angle to lift the lavatory seat. The seat is lowered by pressing on the lavatory seat drawback pedal rod to drive a stop block connected thereto and thereby to push a Y-shaped guide rod and to further push the lavatory seat lifting pedal rod upward and to cause the straight push rod to move downward so as to rotate the L-shaped operating lever backward through the predetermined angle to draw back the lavatory seat.