Automatic yarn cutting device

The utility model discloses an automatic yarn cutting device. The yarn guide device comprises a scale (1), a yarn guide baffle (2), a tool apron blade assembly (5), a linear driving mechanism (7), a base (8), a yarn winding pin (10) and a mounting plate (12), wherein the scale (1) and the base (8) are mounted on the mounting plate (12); the yarn winding pin (10) is fixedly connected with a connecting plate A; the connecting plate A is mounted on a mounting plate (12); the yarn guide baffle (2) is placed on the installation plate (12) and fixedly connected with the base (8), the yarn guide baffle (2) is provided with a guide groove used for guiding when yarn is fixed, the linear driving mechanism (7) is fixedly connected with the base (8), and a moving part of the linear driving mechanism (7) is fixedly connected with the tool apron blade assembly (5) through a connecting plate B. The yarn density detection device has the characteristics of automatic cutting, one-time cutting, high efficiency, more accurate ya