In order to solve the difficulties in the high-speed triggering and long-time triggering of alarm data in the reference data avalanche test of the smart substation monitoring system, the automatic test system for reference data avalanche test is developed, the intelligent control is used to realize the accurate triggering of data signals in the test process. Furthermore, the automatic capture of the test system and the parsing of MMS messages and the generation of test reports are used to realize the optimization of reference data avalanche test closed-loop test. Aiming at the key technologies of precision control of signal trigger time and judgment of test results in the process of realization, the intelligent control plug-in and intelligent automatic comparison are proposed to further improve the accuracy of test system functions. Experimental results show that this automatic test system can effectively improve the quality and efficiency of the reference data avalanche test, so it has promoted value. This work is supported by Science and Technology Project of State Grid Corporation of China (No. B492C0180011).