In view of the problem of low efficiency and difficulty for test record during radar seeker testing, an automatic RF signal test system based on LabVIEW was introduced in this article. Through LabVIEW programming, automation of test instruments, monitoring of all levels of RF signal in hardware-in-the-loop simulation, the function of data storage and analysis and report generation were realized, these greatly improve test efficiency, and strengthen the function of new test. This system has been applied to a variety of radar seekers tests, and achieved good results.