Aiming at the problems existing in the voltage and temperature of electrolytic cell of wet electrolytic copper, combining the development trend and successful experiences of domestic electrolytic industry, an automatic monitoring system for the circuit detection of voltage and temperature of electrolytic cell in the process of electrolytic copper was developed. The system is composed of 64 unit cell monitoring devices and 2 gateways. The unit cell monitoring device processes the collected voltage and temperature data through the ARM processor, and then transmits them to the host for realtime processing and display through the RS485 bus. For the strong electromagnetic interference environment, the system adopts DC/DC power isolation, digital filtering, TVS and selfrecovery insurance technology, which can effectively inhibit the surge interference and improve the security and stability of the system operations.