The invention discloses a fixing device for wool trimming in animal husbandry, which comprises a base, wherein four corners of the top of the base are provided with fixing grooves, the inner walls atboth sides of each fixing groove are respectively provided with grooves at the middle positions, the inner wall at one side of each groove is connected with a second hydraulic cylinder through a fastening bolt at the middle position, a piston of each second hydraulic cylinder is connected with a pressure sensor through a fastening bolt, each pressure sensor is connected with a fixing block througha fastening bolt at the end away from the corresponding second hydraulic cylinder, two ends of the top of the base are respectively connected with two vertical columns through fastening bolts at themiddle positions, the circumferential inner walls of the two vertical columns are sleeved with extension rods, and the top parts of the four extension rods are connected with the same installation plate through fastening bolts. The fixing device can fix the head and limbs of sheep so as to facilitate wool trimming, is applicable to different sizes of sheep, effectively sucks dust and wool in the air into a dust collecting bag, and is flexible and convenient to use.