Artificial rainfall -infiltration experiment is an important study means of runoff process and mechanism. In order to improve the accuracy and reliability of artificial experimental observation, through technological upgrading, this paper developed a new type of artificial rainfall -infiltration experiment system, including three parts of underlying surface system, artificial rainfall observation system and data recording system. 25 artificial rainfall-infiltration experiments were conducted to verify indicators and features of the system. And Horton’s infiltration model was employed in infiltration process line fitting of each experimental session. The fitting result is good, the root mean square error is less than 0.15, the correlation coefficient and Nash efficiency coefficient is about 0.97 and 0.95, respectively. The results show the excellent performance of the system in stability on the time course and spatial uniformity of rainfall, accuracy and time resolution of flow observation, automation degree and portability, which can provide important technical support for rainfall infiltration runoff mechanism research.