The invention relates to a rotary shearing mechanism and a laying head for automatic
fiber laying and forming, and aims to solve the problem that gaps and overlapping defects exist at the boundary of a laying track. The rotary shearing mechanism comprises a motor, a
machine base, a
flange shaft, a driving gear, a linear guide rail, a knife rest
assembly, an extended stepped shaft, a driven gear, a air cylinder sleeve and an air cylinder, and the laying head comprises a rotary shearing mechanism, a re-conveying mechanism, a clamping mechanism, a first guide roller, a
jumping roller, a second guide roller, an adapter plate, a third guide roller, a charging tray, a compression roller cylinder, a compression roller and a frame body. A motor shell is installed on the
machine base, the
flange shaft is fixedly installed on an output shaft of the motor in a sleeved mode and connected with the driving gear, a
piston rod of the air cylinder is connected with one end of the extended stepped shaft, the knife rest
assembly is installed at the other end of the extended stepped shaft, the other end of the air cylinder sleeve is fixedly connected with the driven gear, and the driving gear is meshed with the driven gear. The invention belongs to the technical field of automatic molding of matrix composite materials.