The invention relates to a large-scale photovoltaic power station low voltage ride through detection system suitable for high altitude regions. The system is characterized in that the detection system adopts a vehicle-mounted container structure and is concentrated in three containers by an integrated design; and the three containers are respectively a 10kV drop voltage divider, a 35kV drop voltage divider and a switch cabinet container. Strict electrical test is carried out on key network equipment of a grid-connected photovoltaic power station by the system. The system provided by the invention is of great significance for promoting sustainable sound development of the photovoltaic industry, avoiding off-grid accidents of a large-scale photovoltaic power station and solving the technical problem of safe and stable operation after grid connection of a large-scale photovoltaic power station.