In view of the fact that the radar angle error caused by radar leveling error and system calibration error affects the positioning accuracy of vehicular radar when the vehicular radar is leveling, an error correction algorithm is proposed. The angle error caused by radar leveling is measured by the designed corner interface box device, and the azimuth calibration error correction of vehicular radar is realized. The test results show that the positioning accuracy of the vehicle radar has reached the leading level in the same industry in China.