The invention discloses a fixture for a machine tool. The fixture comprises a base. The base is provided with a baffle and a support. A clamping block connected through a screw rod is arranged between the support and the baffle. The other end of the screw rod stretches out of the support and is connected with a handle through a bolt. The periphery of the support and the baffle is provided with a sewage tank. The sewage tank is internally provided with drain holes. One side of the baffle is provided with an abutting device. The abutting device comprises a stand, a supporting plate, a jacking rod and an adjusting bolt. The middle of the supporting plate is provided with an adjusting groove. The supporting plate is fixed in the adjusting groove through the adjusting bolt and is arranged on the stand. The jacking rod is arranged at the front end of the supporting plate. The top of the supporting plate is provided with an adjusting rotary knob for fixing and adjusting the jacking rod. The jacking rod is further provided with a limiting hole for adjusting the rotary knob and positioning. By means of the fixture for the machine tool, product stability in the machining process is greatly improved, accuracy in the machining process is guaranteed, product quality is improved, and the defective percentage is lowered.