The utility model relates to an immobilization device for clinical dissection of a veterinarian, in particular to a simple immobilization device for the veterinarian to clinically dissect a snake and other small vertebrates. A foldable W-shaped fixing device consists of an immobilization device, a fixing needle and a fixing needle hole. The fixing needle is inserted into the fixing needle hole in an immobilization plate to complete fixed connection. The foldable W-shaped fixing device is simple and convenient to use and capable of quickly fixing the snake and other small vertebrates, accordingly the immobilization time required by clinical snake dissection is remarkably shortened, improvement of the working efficiency of the veterinarian and other workers is facilitated, and experimental errors are decreased.