Oceans contribute nearly half of global net primary productivity (NPP). Therefore, accurate assessment of its level plays a key role in understanding the global carbon cycle, climate change and ecosystem functions. It is found that ultraviolet radiation (UVR) has negative and positive effects on marine NPP. Nevertheless, the majority of culture flasks currently used have low transmittance to UVR, thus shielding the UVR effects on marine NPP. In this paper, based on the existing research, we use linear regression and generalized additive model (GAM) for analyzing the UVR effect on marine NPP. The predictors are UVA (320-400 nm) and UVB (280-320 nm) irradiance, cell size obtained by mesh filtration, and primary productivity with UV shielding, and the response factors are the effect of UVR in UVA and UVB bands on NPP. The UVA and UVB effect models obtained show that higher UVA irradiance, a lower proportion of small-sized cells and lower productivity lead to stronger UVA inhibition; UVB inhibition increases with UVB irradiance. The models are further applied to obtain corrected values. The results show that the global marine NPP from satellite remote sensing is approximately 46.9 Pg C year^-1, while NPP after UVR correction is 45.7±5.5 Pg C year^-1, a decrease of approximately 2.6%. Spatially, there are significant differences in the UVR effects: (1) in the vertical distribution, UVR significantly inhibits surface NPP, but at 20~120 m depth, UVR (mainly UVA) promotes it; (2) in the horizontal distribution, mainly affected by the cell size, UVR inhibits nearshore NPP but promotes it in the open ocean at low latitudes and mid-latitudes; (3) in the latitudinal distribution, also mainly controlled by cell size, UVR inhibits NPP in the Northern Hemisphere but promotes it in the Southern Hemisphere. Overall, UVR may not significantly change the estimation of the global marine primary productivity total level, but its impact on NPP in different sea areas and water depths is quite different. This provides a certain reference value for further research.