Cutting force and cutting heat are two main reasons for the wear of diamond tools. An effective way to reduce the cutting temperature is minimum quantity lubrication (MQL). To explore the effect of MQL on the cutting temperature, a calculation model for the cutting temperature of micro diamond tool under dry friction condition is established firstly by using the Fourier's law of heat conduction, through which the maximum temperature of the tool can be acquired. Regarding the boundary film as a layer of heat-conducting medium, a revised calculation model for the temperature distribution on tool rake face under MQL condition with different cutting fluids is further established. As expected, the wear volume of micro diamond tool can be successfully predicted by using the Usui wear rate model in response to different cutting fluids and different cutting distances. Finally, cutting experiments with different cutting fluids are performed to verify the established models. The experimental observations agree well with the theoretical prediction results. Such satisfactory consistency confirms that the cutting fluid with low viscosity can reduce the cutting temperature and inhibit tool wear effectively.