In this work, the Algerians perception of COVID-19 is analyzed using the results of a national online survey, carried out among 1000 people. Indeed, we are interested in their point of view on this disease and its dangerousness as well as the indicators which influence these perceptions. In addition, this study examines how the Algerian perception of COVID-19 affects their mobility during and after lockdown. Finally, a simulation is carried out to examine the impact of mobility and compliance with precautionary measures after the lockdown on the risk of a new spread. Among the most relevant results one can retain the fact that Algerians’ dangerousness perception does not affect their mobility, but has a direct effect on their decision to come back work. Furthermore, the simulations’ results highlighted the level of precautions needed to avoid a high risk of contamination upon lifting the lockdown.