Aiming at the shortcomings of silicon photodiode type radiation sensor used in rotating shading solar radiation monitoring system, such as narrow spectrum, low precision and poor long-term stability, a method of dynamic calibration of silicon photodiode array using thermonuclear array is proposed, and a lightweight, low-cost and high-precision rotating shading solar radiation monitoring device is designed. The detection system uses static process and dynamic process to detect in real time alternately. It is divided into static acquisition of light intensity and dynamic acquisition of light intensity changes of thermonuclear array and silicon photodiode array in the rotating process of the light shield. By calculating the solar altitude angle and subsequent data processing, the value of total solar radiation, direct radiation and scattered radiation can be obtained. The error analysis figure shows that the root mean square error of the total radiation is 1.859 W/m2, the direct radiation and the scattered radiation are 2.922 W/m2 and 2.770 W/m2, respectively. Compared with the single silicon photodiode array, the root mean square error is reduced by 8.908 W/m2 and 5.454 W/m2, respectively. It is proved that the measurement method has high detection accuracy.