Research is conducted on the standardization of oil monitoring data for special vehicles in high-altitude environments, targeting environmental characteristics such as high altitude, temperature and humidity, air-density, atmospheric pressure, and light intensity. Propose the concept of metadata processing for oil monitoring, use principal component analysis method, calculate the data threshold through monitoring data correlation analysis, and establish a reference standard for the oil status and fault diagnosis threshold of a certain type of special vehicle. The results indicate that this study establishes a basic framework for high-altitude oil monitoring work and can provide effective references for other similar vehicle models.