The present invention relates to an angle adjusting device of a livestock ventilator, and more particularly, by adjusting the ventilation angle of the livestock ventilator freely by rotating a fan fixing rod to which a plurality of livestock ventilators are fixed. It relates to an angle adjusting device of the livestock ventilator that can maintain the angle. The angle adjusting device of the livestock ventilator of the present invention, Barn horizontal frame 10； A barn vertical frame 20 formed at both ends of the barn horizontal frame to support the barn horizontal frame； A plurality of fans 40； In the barn horizontal frame is formed at a right angle, and the fan is fixed to a predetermined interval spaced apart a plurality of ventilator fixing rods 30； In the angle adjustment device of the livestock ventilator comprising a, A bar support part 400 coupled to the lower side of the barn horizontal frame and having a coupling hole 410 formed at an end thereof so that any end of the fan fixing bar is inserted into the barn horizontal frame； A rod coupling hole 120 is formed so that any end of the ventilator fixing rod is inserted into a central portion, and the protrusion 130 is formed to extend to both sides of the central portion, and the chain is coupled to any one side of the protrusion. An angle adjusting member 100 having a chain fixing hole 110 formed therein； A roller holder 320 which is formed to protrude on one side of the barn vertical frame； It is inserted into the roller holder, and the chain holder roller 300 is formed with a mounting groove 330 for mounting the chain 200； A chain holder 310 formed to protrude on the other side of the barn vertical frame to mount the chain mounted on the mounting groove； It is characterized in that it comprises a； one side is coupled to the chain fixing hole, the other side chain 200 is mounted on the chain holder. The present invention provides an effect of freely adjusting the blowing angle of the livestock fan by rota
