Abstract: As we all know, the solar radiation can cause ionospheric disturbances such as ionospheric storms, which have great influence on short wavelength communication and satellite navigation. As a result, the global ionospheric monitoring is very important for accurately predicting of ionospheric disturbances. This paper proposes a new ionospheric microsatellite constellation network, which aims to realize dynamic monitoring of the global ionosphere based on the GNSS radio occultation technology. It adopts 8×8 microsatellite constellation on solar synchronous orbits at an altitude of 1020 km. The simulation result of satellite orbit show that it can monitor global ionospheric parameters such as electron density, TEC, index of refraction and bending angle. According to the simulation result, under 2°×2° grid, the coverage at low, middle and high latitudes at 300 km altitude are 31.83%, 49.84% and 75.25%, respectively. And the horizontal resolution is better than 200 km for more than 70% of the world. This new constellation network can make up for the lack of ground-based detection coverage in the ocean region and improve the global coverage of the ionosphere. Additionally, based on the International Reference Ionosphere (IRI) model, and simulated satellite orbits, the monitoring effects during a magnetic storm are simulated. The results show that this constellation can monitor the dynamic global response of the ionosphere with a time resolution of 2 hours, which can be expected to provide a new perspective for the study of magnetosphere-ionospheric coupling and the global evolution of the ionospheric storms, and support the prediction of space weather.