The electrical contact on-line temperature measuring device is an intelligent device used in high, middle and low voltage power systems (110KV, 6-35KV and 0.4KV) and electrical contact equipment with high temperature requirements. It integrates online temperature measurement, data acquisition and data analysis, and control functions into a modern high-tech product. Its various technical indicators can reach international standards. The online temperature measuring device of electrical contacts has the number of online temperature collection points that can be set, and the data continued units can be selected according to the site conditions. The device provides a communication interface that can be connected to a computer monitoring system, supports RS485 interface MODBUS communication protocol or multiple protocols, and the baud rate is optional.