The so-called desensitization injection method is a method of injecting tetanus antitoxin in small doses to patients with positive allergy tests for the purpose of desensitization. The specific method of tetanus antitoxin desensitization injection is as follows: In general, the original tetanus antitoxin solution is injected in four times: for the first time, 0.1 ml of tetanus antitoxin (1500 IU/ml) solution is taken, plus 0.9 ml of saline for injection, and after 20 minutes of observation, there is no positive reaction or no other adverse reaction, and then the second injection is given. The second time, 0.2 ml of tetanus antitoxin was taken, plus 0.8 ml of saline, diluted and then injected; the third time, 0.3 ml of pertussis antitoxin was taken, plus 0.7 ml of saline for injection; the fourth time, 0.4 ml of tetanus antitoxin plus saline was diluted to one ml, and then injected. Each injection should be given at an interval of 20 minutes, and at the same time, observe whether there is any adverse reaction and whether there is any rash in the injected area. After completing all four desensitization injections, the patient should continue to stay in the hospital for 30 minutes for observation before leaving the hospital. If adverse reactions occur during the injection process, such as urticaria, symptomatic treatment should be done, and when the adverse reactions subside, the tetanus antitoxin solution should be further diluted and injected again, which means that the number of injections should be increased until all the tetanus antitoxin is injected, or tetanus immunoglobulin can be used instead. For those who are allergic to tetanus antitoxin, tetanus antitoxin injection can be completed by using this desensitization injection to effectively prevent the occurrence of tetanus.