Adjustable clamp of sand blasting machine

The utility model discloses an adjustable fixture of a sand blasting machine, which relates to the technical field of sand blasting machines and comprises a sand blasting box, an air cylinder is mounted on the top surface of the sand blasting box, a rotating disc is rotatably arranged at the output end of the air cylinder, a two-way screw is rotatably arranged in the rotating disc, and the two-way screw is connected with the air cylinder. Guiding blocks are oppositely arranged on the outer surface of the two-way screw in a threaded and sleeving mode, a guiding groove is formed in the rotating disc, the rotating disc slowly descends by starting the air cylinder, the two movable blocks are pulled at the same time, the movable blocks extrude the springs, then the first clamping plate moves, when the rotating disc is attached to the top end of a workpiece, the air cylinder stops working, then the movable blocks are loosened, and the workpiece is clamped. Under the acting force of the spring, the first clamping pl