For the difficult measurement and low measurement accuracy on the surface temperature of a strong reflector,starting from the principle of infrared temperature measurement,it is analyzed and revealed that the precision of infrared temperature measurement is easily affected by the reflectivity,the measuring distance,the measuring environment and the infrared incidence angle of the object under test in this paper. According to the actual requirement of measuring the surface temperature of the roll in an aluminum sheet processing equipment,a scheme of measuring the surface temperature point-to-point of a strong reflector by infrared sensor is designed. Through the research and analysis of the measured data,an infrared incident angle compensation algorithm based on the Stefan's law is established to reduce the temperature measurement error caused by the change of the infrared incident angle. Experimental results show that this method can make up for the error of temperature measurement caused by the change of infrared incidence angle and improve the precision of temperature measurement. The compensation algorithm has simple operation and strong adaptability and provides a new method to improve the influence of the incident angle on the temperature measurement accuracy.