There are millions of ammeters working in China and daily manual inspection of their status consumes immense manpower and material resources. Besides, manual inspection is inevitably affected by factors such as the levels of evaluation skills and tiredness. To solve the problem, we propose an ammeter safety status assessment method and construct a software system for the ammeter inspection task, which encapsulates smart detection and evaluation algorithms for ammeter and its parts into an app and website. The use of this system has greatly reduced the workload of ammeter inspection tasks and unify the standards for defect judgment. Meanwhile, raw data and its analysis results are kept in the system and can be reused to improve the system further. The system has been deployed in the electric power system of Hangzhou and creates millions of economic values.