The invention discloses an irrigating and disinfecting integrated testing device. The irrigating and disinfecting integrated testing device mainly comprises a centrifugal pump, a pressure sensor, a flow sensor, an ion concentration sensor, a control system and the like, has comprehensive functions of fertigation, micro-sprinkling and dropping irrigation load simulation, water and fertilizer parameter detection, fertilizer absorbing channel parameter detection, backflow channel parameter detection and the like; furthermore, on the aspects of irrigation, nutrient solution dynamic preparation, nutrient solution disinfecting and the like, the detection of nutrient solution nutrient iron concentration information is combined effectively, therefore the high-precise nutrient solution dynamic preparation and irrigated area load simulation are realized very well, the requirements on a test system during a research and development process of a fertigation are satisfied. The irrigating and disinfecting integrated testing device is applicable for research of facility agriculture precise irrigation and nutrient solution accurate preparation technology and development of system.