Abstract:With the development of highperformance sensors and the industrial internet, online oil monitoring technology has been rapidly developed and applied. The construction method of online monitoring oil information system based on industrial Internet was introduced from two aspects of software system and hardware; in terms of software system, data acquisition system architecture, online oil monitoring system architecture, development environment and steps, functional modules and other relevant contents were introduced; in terms of hardware, four main types of sensors such as the kinematic viscosity sensor, moisture content sensor, pollution sensor and abrasive particle sensor were introduced. In addition, online and offline monitoring data were compared to verify the accuracy and effectiveness of the online monitoring system