Yarn cutting mechanism of warp knitting machine

The utility model discloses a yarn cutting mechanism of a warp knitting machine. The yarn cutting mechanism comprises a cutting mechanism and a matched base mechanism located below the orthographic projection of the cutting mechanism. The cutting mechanism comprises a fixing support and a first air cylinder fixed to the fixing support, a lifting plate is fixed to an output shaft of the first air cylinder, a first cutting blade is detachably connected to the bottom of the lifting plate, first stand columns are fixed to the portions, located on the two sides of the first cutting blade, of the lifting plate, and the ends of the first stand columns are sleeved with buffer blocks. A first spring is fixed between the inner bottom of the buffer block and the bottom of the first stand column, and a thread catching groove is formed in the first cutting blade. According to the technical scheme, through the arrangement of the buffer block and the first spring, the buffer block can stably abut against the matched base me