Injection fixing device for animal husbandry and veterinary medicine

The injection fixing device comprises a protective U-shaped fence, connecting plates are symmetrically arranged on the two sides of the protective U-shaped fence, adjusting assemblies for fixing are arranged at the top ends of the connecting plates, the upper sides and the lower sides of the two sets of symmetrically-arranged adjusting assemblies for fixing are connected with a first arc-shaped hoop piece and a second arc-shaped hoop piece respectively, and the first arc-shaped hoop piece and the second arc-shaped hoop piece are connected with the protective U-shaped fence. The adjusting assembly for fixing comprises a fixed rail groove, an adjusting lead screw, an adjusting sliding block, a first connecting rod and a second connecting rod, the fixed rail groove is formed in the top end of the connecting plate, the adjusting lead screw is rotationally arranged in the fixed rail groove, and the adjusting sliding block is arranged in the fixed rail groove in a sliding mode and arranged on the adjusting lead scr