The invention provides an automatic generation method and system for a test script. After a logic expression is obtained and a mapping relationship between a decision condition and an ICD (Interface Control Document) variable is obtained, a test case set corresponding to the logic expression is generated, and the ICD variable corresponding to each decision condition in the logic expression is determined according to the mapping relationship between a decision condition and the ICD variable; and on the basis, according to the ICD variable corresponding to each decision condition in the logic expression and the test case set, generating the test script corresponding to each test case in the test case set. Obviously, an automatic test script generation scheme is realized, the generation efficiency of the test script can be effectively improved, and the introduction of manual errors including grammatical errors, semantic errors and the like can be avoided.