Abstract: As core equipment of smart power grids, relay protection devices are subject to increasingly stringent requirements for reliability and stability. In the industry, the production mode of relay protection devices mainly relies on manual assembly and functional testing, which leads to drawbacks such as low assemblyandtesting efficiency and poor quality consistency. To address the technical bottlenecks in the production, assembly and testing of relay protection devices, it is imperative to develop an integrated intelligent assemblyandtesting system for relay protection devices. Collaborative robots combined with highprecision visionbased positioning algorithms are adopted to realize automatic identification and precise assembly of board modules. An intelligent test environment is constructed jointly by the boardswitching subsystem and the switchingin/out subsystem to enable flexible production and testing of the devices. Successfully deployed at the National Intelligent Manufacturing Demonstration Factory of NARI-Relays Electric Power Equipment, this system has significantly improved the assembly and testing efficiency of relay protection devices and delivers favorable demonstration value for the industry.