Automatic thread shearing mechanism used in narrow space

The invention discloses an automatic thread shearing mechanism used in a narrow space. The automatic thread shearing mechanism comprises a rocker arm, a balance block, a motor, an ox horn tip, a knifegroove, a first transmission rod, a second transmission rod, a driving bevel gear, a transmission bevel gear, a drive bevel gear, a driven bevel gear, a transmission mechanism, a connecting mechanism, a needle plate, a cylindrical gear, a transmission gear and a guide column. The balance block is fixed at one end of the rocker arm, the ox horn tip is arranged at the other end of the rocker arm, the motor is arranged in the rocker arm, the output end of the motor is provided with the drive bevel gear, and the side edge of the rocker arm is rotationally provided with the first transmission rod;the transmission bevel gear is arranged at the top end of the first transmission rod, and the transmission bevel gear is in meshed connection with the driving bevel gear. The whole sewing structure of the automatic thread she