The invention relates to an automatic generation method for test cases of an intelligent alarm injection test system. The method is characterized by comprising the following steps of 1, determining anordering principle of fault signals according to test logic in a fault identification logic diagram, and then editing an equipment name, signal description, interval, state value and quality factor of a fault signal test case sequence template to form a single fault signal test case sequence template file; 2, forming a fault signal test case sequence template file library; 3, automatically mapping the fault signal test case sequence template file in the fault signal test case sequence template file library in the second step with a fault signal in an actual project SCD to form an instantiation test case file for specific faults. By means of the automatic generation method for the test cases of the intelligent alarm injection test system, the repeated use of the template is achieved, the generation time of the test cases is shortened, and the work efficiency is improved.