Objective: to analyze the temporal trend of Web Food and Nutrition Surveillance System (SISVAN Web) coverage of children under 5 years old in the Northern Region of Brazil between 2008-2017. Methods: this was an ecological time series study with data from SISVAN Web; coverage annual percentage change (APC) was estimated using the Prais-Winsten regression model. Results: SISVAN Web coverage in the Northern Region in 2008 and 2017 was 12.2% and 37.9%, respectively, with a rising trend (APC=14.2%-95%CI 10.9;17.6); the states and health regions showed similar trends; Acre was the state with the highest APC (17.3%-95%CI 13.6;21.1). Conclusion: there was a rising trend in SISVAN Web coverage in the Northern Region as a whole, in all its states and in all its health regions.