Abstract: With the rapid development of new energy vehicles worldwide, new energy commercial vehicles differ significantly from passenger cars due to their large cargo and passenger capacity and long operating mileage. The battery is facing more stringent working conditions, with high risk of thermal runaway, fast decay, and low charging efficiency. The upgrading of safety detection technology is urgent. This article focuses on the safety detection technology of new energy commercial vehicle power batteries, deeply analyzes its development trend, first expounds the common safety problems of new energy commercial vehicle power batteries, and then analyzes the advantages of safety detection technology in risk prediction, full scene detection, etc., and introduces application methods such as online detection of electrical performance and thermal runaway warning detection. The study believes that this technology will develop towards intelligent fusion detection, AI predictive detection, portable rapid detection, and full cycle dynamic detection in the future, which is of great significance for improving the safety of new energy commercial vehicles and promoting industry progress.