The invention discloses a juice extractor which comprises a base and a cup lid. A bearing is arranged at the opening end of the base, an output shaft of a motor in the base is connected with a rotating shaft through a coupler, the rotating shaft is sleeved in the inner ring of the bearing, a motor switch is arranged in the middle of the outer surface of the base, a juice cup is fixed to the upper surface of the base, a cutter at the bottom in the juice cup is connected with the rotating shaft, a valve is installed on a juice outlet guide pipe in the juice cup, a cutter rest is movably clamped in an installation groove in the juice cup, an electric expansion rod is fixed to the inner top end of the cup lid and is connected with a circular pressure plate through a movable rod, an electric expansion rod switch is arranged in the middle of the outer surface of the cup lid, and an internal thread in the opening end in the cup lid is matched with an external thread in the outer surface of the juice cup. The juice extractor is simple in operation, convenience in use, capable of dividing fruit evenly into small pieces, low in labor consumption, rapid in cutting and squeezing fruit, good in sealing effect and capable of preventing splashing of juice effectively.