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With the popularization of smart grid, the low-voltage centralized meter reading system has become the mainstream way of power measurement. Due to the high coupling between the automatic test platform and the meter reading system under test, the adaptability of the test platform will deteriorate after the system is upgraded. Based on the idea of hardware-in-the-loop simulation, a generalized and automated test platform with embedded control software is pro-posed in this paper. The hardware unit under test is separated from the test platform, and connects with the client soft-ware by means of a unified tooling protocol. This could reduce the coupling between modules while retaining the transmission delay and electromagnetic interference in the real test scenario. The modular script testing technology is introduced to realize the regression comparison of test data and expected data, enriches the coverage of test cases, and improves the test efficiency and accuracy. In addition, in order to avoid the Repetitive work for the same test function during system upgrade, the platform generates new test scripts by grouping basic test blocks together. This innovation can shorten the development cycle and improves the universality of the test platform. The test results show that the accuracy of the platform is improved by 40%, and the test efficiency is improved by 75%, compared with manual test.