The utility model relates to an extensible table with turnover top whose desktop is composed of a desktop which is drawable to right and left and a roll-over desktop. The right and left end of the both sides frame of the desk are respectively equipped with a guideway by screws, while the middle parts of inner sides of the two frames is respectively provided with a bore penetrating into a rotary shaft respectively. The two rotary shafts are fixed in the middle of both back sides of the roll-over desktop respectively by screw. The both back sides of the desktop which are drawable to right and left are fixed in guiding wood by screw. A slot is equipped on the guiding wood. A guiding slot is composed of a backside of the drawable desktop and the guiding wood with a slot. The desktop which is drawable to right and left can be drawn separately to left and right along the guideway through the directional slot. The utility model can expand the desktop, and it's convenient for use.