A dustbin with an adjustable height comprises an outside container body, an inside container body, a compression spring provided between the bottom of outside container body and the bottom of inside container body, a longitudinal row of grooves provided at the side wall of the inside container body and a level regulator provided at the side wall of the outside container body. The level regulator has a left end for embedding in the groove and a right end for coupling with a switch means to control the horizontal motion of the level regulator. The height of inside container body can be adjusted to satisfy the users of different heights by the level regulator.