Low voltage ride through (LVRT) capability, as an important capability of grid-connected photovoltaic inverters, is related to the stability of the entire power grid system. Aiming at the requirements of LVRT standards, this paper designs a LVRT detection system for photovoltaic inverters based on virtual instrument technology, and designs a dedicated detection test platform. By analyzing the requirements of the test standards, this paper studies the calculation of the fundamental positive sequence line voltage based on the test data. Methods of important parameters such as effective value and reactive current; the use of LabVIEW software to develop automated LVRT detection software, that can realize the detection and analysis of the various parameters of the AC inverter"s AC side during the LVRT test and the evaluation of the test results. The LVRT capability of a photovoltaic grid-connected inverter was tested on this platform. The results show that the system with a high degree of automation, strong scalability and the detection capability meets the requirements.