The invention discloses a loop-forming machine of a few-guide-bar yarn-pressing warp knitting machine. The loop-forming machine comprises a groove pin fixedly mounted on a groove pin bed, a pin core fixedly mounted on a pin core bed, a sinker fixedly mounted on a sinker bed, a yarn pressing plate and groove pin up-down movement mechanism fixedly mounted at the lower end of a yarn pressing plate mounting base, a groove pin swing mechanism, and a guide bar mechanism provided with a plurality of guide bars, wherein the guide bar mechanism is provided with at least ten guide bars which are a first jacquard guide bar, a second jacquard guide bar, a first ground guide bar, a second ground guide bar, a third ground guide bar, a first grouped pattern guide bar, a second grouped pattern guide bar, a third jacquard guide bar, a fourth jacquard guide bar and a spandex guide bar in the direction from the front to the rear of the machine; the yarn pressing plate is positioned between the second jacquard guide bar and the first ground guide bar, and is driven by the yarn pressing plate up-down movement mechanism to do up-down linear motion. The loop-forming mechanism is reliable in yarn-pressing action, is rich in fabric pattern, and can meet the development trend of pattern diversity.