The invention discloses a screen cloth fixing structure for a square swinging screen. The screen cloth fixing structure comprises a square screen cloth, an S-shaped spring clip and a screen frame, wherein a plurality of strip holes are uniformly distributed on a screen frame on both sides of the square screen cloth; both sides of the bottom plate of the screen frame respectively turn up to form U-shaped clamping grooves of which the openings are opposite; and the top end of the S-shaped spring clip extends vertically to form a vertical clamping edge in interference fit with the strip holes of the square screen cloth, and the bottom end of the S-shaped spring clip extends transversely to form a transverse clamping edge in interference fit with the U-shaped clamping grooves of the screen frame. According to the screen cloth fixing structure disclosed by the invention, the screen cloth can be conveniently and quickly replaced, the working time is saved, the tension of the screen cloth is moderate, the service life of the screen cloth is prolonged, and the screening efficiency is improved.