High-voltage(HV) voltage transformers(VT) are widely used in the power industry, and their accuracy is directly related to the interests of power users and power grid-related enterprises. Therefore, it is of great significance for transformer verification. However, nowadays it mainly relies on manual verification, which is inefficient, and the verification work in a high-pressure environment will threaten the safety of the verification personnel. In this regard, the HV voltage transformer detection system developed in this paper based on digital signal processor (DSP) reduces manual intervention, not only improves the accuracy and reliability of verification results, but also improves the safety level of verification operations. In the application analysis experiment of the detection system, the phase test experiment of the voltage signal proves that the phase output accuracy of the verification system designed in this paper meets the design requirements.